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If you’re new to the aquarium hobby, you might think that keeping fish is a tad – dare we say it – boring! After all, your pets spend their days swimming around the tank, eating and nibbling on algae, and not really doing much else, right?

However, that’s not the case with every fish species. So read this guide to discover ten fish species known for their playful behavior and interaction, adding a lively dynamic to the aquarium.

Key Takeaways

• Explore the unexpected playful side of pet fish, from Bettas performing tricks to Goldfish interacting with their owners.
• Aquarists can find joy in the unique behaviors and interactive qualities of various fish, including the ornate swimming of Neon Tetras and the symbiotic relationship between Clownfish and their anemones.
• Success in keeping these engaging creatures comes from attention to each species’ environment and nutritional needs, underscoring the rewarding nature of the fishkeeping hobby.

Summary Table

Here’s a handy table summarizing the key facts you’ll need to know if you want to take home any of our featured fish and add them to your aquarium!

Summary Table of Playful Fish Species

Betta Fish (Betta splendens)

Betta fish, also known as Siamese Fighting Fish, are popular freshwater aquarium fish best known for their vibrant colors and fancy, flowing finnage.

Bettas come from Asia, especially Thailand, Cambodia, Laos, and Vietnam, where they inhabit shallow, slow-moving waters like rice paddies, ponds, and marshes. These labyrinth fish are relatively hardy and adaptable, preferring a mainly carnivorous diet of insect larvae, insects, and small crustaceans. That said, they do enjoy nibbling on algae and small amounts of plant matter to supplement their diet.

Betta fish are not only beautiful but also have great personalities! They usually learn to recognize their owners and can be trained to do tricks like swimming through hoops and jumping out of the water to grab a morsel of food from your fingers.

If you’re planning on getting a betta fish for a pet, bear in mind these fish can be pretty aggressive, and you can never keep two males together in the same tank.

Dwarf Gourami (Trichogaster lalius)

The beautiful Dwarf gourami is known for its curious behavior and interactive nature. The species’ vibrant colors and unique patterns make it a firm favorite with aquarists. These fish come in a range of colors, including red, blue, and green, and have a distinctive iridescent, metallic sheen that makes them stand out in any setup.

Dwarf gouramis are quite small, reaching only around 3 inches long at maturity, and are native to the slow-moving waters of South and Southeast Asia.

I love keeping Dwarf Gouramis as pets for their curious nature and interactive behavior. My gouramis seem to enjoy following me when I walk past their tank and dart to the water’s surface to grab a mouthful of air. These curious fish spend much of their day exploring their environment, playing with tank decorations and toys, such as a ping pong ball floating on the surface.

Jack Dempsey Cichlid (Rocio octofasciata)

Jack Dempsey cichlids are popular freshwater aquarium fish known for their playful behavior and unique appearance.

These South American natives are named after the famous boxer due to their aggressive and feisty nature. They can reach 10 inches long when fully grown, so large fish tanks are required to accommodate one of these guys.

Although not renowned for their ability to perform tricks, Jack Dempsey cichlids are still pretty interactive, curious, and playful. These fish have a love of rearranging the hardscape you worked hard to set up, moving rocks and decorations around to their liking. On the downside, Jack Dempseys can be aggressive towards other fish, although they can live with other larger, similarly belligerent species in a large enough tank.

Goldfish (Carassius auratus)

Goldfish are my favorite freshwater fish and have been for over 40 years!

They come in many different varieties, ranging in size from 6 to 8-inch fancy types to 12-inch long pond fish. You can keep most types of goldfish in a large tank, although most are happier living in a spacious garden pond with plenty of swimming space.

In addition to their amazing variety of colors, goldfish can be quite interactive. For example, my goldfish would beg for food whenever I passed their aquarium and would investigate my fingers when I was carrying out water changes and vacuuming the substrate. I even trained my Orandas to take food morsels from my fingers!

Neon Tetras (Paracheirodon innesi)

Fish like Neon Tetras are known for their schooling behavior, which can be fascinating to watch as they dart around the tank and interact with each other.

These brightly colored little fish can be quite skittish, and it’s entertaining to watch them flitting through clumps of dense plants and exploring their tank decorations. Neons are somewhat easier to care for than their slightly larger cousins, Cardinal tetras, and make just as impressive a display when kept in large groups of ten or more.

That said, these swimming gems need a well-maintained tank, stable water parameters, and a high-quality diet to thrive.

Clownfish

The movie Finding Nemo made Clownfish famous, although they were already an extremely popular go-to marine fish that graced many beginner’s saltwater tanks.

These beauties are well-known for their playful antics and interaction with their owners. They beg for food and come up to the viewing panes to see what you’re up to when you pass their aquarium.

Although Clownfish won’t talk to you like the piscine movie star, they will enjoy a symbiotic relationship with their anemone if you provide one. The interactive relationship between the Clownfish and the anemone is a fascinating one. The Clownfish is immune to the anemone’s stinging tentacles, using them as protection from would-be predators. The anemone enjoys devouring the Clownfish’s leftovers and also receives its protection from predators.

Guppies (Poecilia reticulata)

Guppies are lively and colorful fish who enjoy swimming around the tank and interacting with their tank mates. They also breed constantly, so you’ll never be short of replacements for any casualties if you keep this species!

I remember keeping a whole bunch of guppies in a large community tank one time. Those beautiful little fish kept me entertained for hours, their bright colors flashing through the lush plants in the aquarium was quite a site, as they chased each other, and looked for food scraps at feeding time.

Another highly entertaining habit my guppies had was hanging around in the filter outflow, using the current to carry them up to the water’s surface, and diving back down to start the ride over, time and again!

Kuhli Loaches (Pangio kuhlii)

Kuhli Loaches are slender, eel-like fish that are known for their playful behavior, often darting in and out of hiding spots in the aquarium at lightning speed.

These rather cool, oddball fish are fascinating or freaky, depending on how you look at it! Although they don’t eat algae, these weird fish can still make excellent clean-up crew members, scavenging scraps of leftover food. That said, you need to feed them to prevent them from going hungry. The loaches enjoy sinking pellets, frozen bloodworms, and live blackworms.

If you have a moonlight setting on your aquarium lighting unit, try watching the Khuli loaches at night since they tend to be most active and less shy once the sun goes down. You can keep these fish in a planted tank, and they do well in a community tank with snails, shrimp, and other peaceful fish species.

Plecos (Hypostomus plecostomus)

Plecos, also known as plecostomus or sucker-mouth catfish, are a diverse group of freshwater fish belonging to the family Loricariidae. They are popular among aquarium enthusiasts for their distinctive appearance and algae-eating habits.

Several popular species are available, including the bizarre-looking Bristlenose pleco with its bristly snout, the Rubber Lip pleco, and the beautifully colored Gold Nugget pleco. Don’t make the mistake of taking home a juvenile Common pleco unless you have a very large tank since these fish can reach over a foot in length!

Plecos are known for their algae-eating behavior, which helps to keep aquariums clean. These fish are typically nocturnal, spending much of their day resting on surfaces or hiding in caves or crevices. So, if you want to watch them play and interact with their environment, you must be a night owl with a moonlight setting on your tank lighting system!

Corydoras Catfish (Corydoras paleatus)

Corydoras catfish are another of my favorite aquarium fish species and have featured in all my tanks.

These cute little fish only grow to a couple of inches long and come in many different varieties, all of which are peaceful and work well in a community aquarium. Corys come from the coastal rivers in Brazil and Uraguay, especially the lower Paraná River basin, and have been favorites with hobbyists for many decades.

Corys do best when kept in small groups of at least five individuals, sitting on the substrate and resting for much of the day. Then, just when you were watching your other fish cruising gracefully around the tank, a cory flies abruptly up to the surface to snatch a gulp of air before plunging back to the substrate again.

As a bonus, these highly entertaining little fish are incredibly hardy and will provide you with up to seven years of fun.

Final Thoughts

If you thought keeping fish was a boring hobby, I hope this article has made you think again!

As you’ve learned, you can keep many highly entertaining, playful, interactive fish in a basic freshwater aquarium setup. Provided you give your chosen fish species a well-maintained environment and a high-quality diet, your aquatic pets should provide you with years of fascinating viewing.

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If you’ve been in the aquarium hobby for a while, you’ll probably have heard of UV sterilizers. By passing water through UV light, the sterilizer reduces the number of algae and bacteria suspended in the water column.

But while many people claim that UV sterilizers are useful for clearing up cloudy or green water, there are other ways to do that, too. So do you really need this optional aquarium accessory? Here, you’ll find out.

What Is a UV Sterilizer?

A UV sterilizer is an optional piece of aquarium equipment used to reduce the presence of algae, bacteria, and other pathogens within the water column.

The unit works by running the tank’s water past a germicidal fluorescent UV lamp that damages the DNA of the microorganisms within the water column, thereby preventing them from reproducing and reducing their numbers within days.

UV sterilizers are usually either standalone units that use a motor to pump water through a sealed chamber or are passive units without a motor that rely on a canister filter to pump water through them.

Very occasionally, canister filters and hang-on-back filters come with UV sterilizers already installed.

When Are UV Sterilizers Used?

Most aquarium owners don’t use UV sterilizers as they are strictly an optional accessory. Those who do choose to keep one typically only turn it on for short periods to treat green or cloudy water, and to help contain bacterial or even parasitic and fungal infections.

For Treating Green or Cloudy Water

UV sterilizers are especially useful in clearing water of algal blooms that turn the water green, or bacteria blooms that make the water cloudy. When effective, UV treatment may even clear the water within a few days.

For Treating Infectious Diseases

Some aquarists also believe that, when used at the right time, UV sterilizers can help to contain outbreaks of parasitic infections like ich and help to reduce the chances of bacterial infections on vulnerable specimens.

While a UV bulb won’t cure fish infections without additional treatments such as medication, it may help to reduce the pathogens from reproducing, as well as reduce the risks of further outbreaks.

Because of this, some aquarists choose to turn their UV units on when their fish are particularly stressed or injured and therefore more susceptible to infection.

When UV Sterilizers Won’t Help

It must be understood that UV sterilizers can only treat microbes that are already suspended within the water column. Organisms that already are floating on the surface or adhered to rocks, glass, plants, gravel, or your aquatic pets won’t run through the unit and are therefore left untreated.

So, while UV can be very effective for treating algae and cyanobacteria suspended in the water, it won’t be much help for treating algae outbreaks on your substrate, glass, and aquarium décor. Similarly, it will only treat parasites in the phase where their offspring are suspended in the water.

Additionally, UV sterilizers are unlikely to help if your water has been stained yellow or brown. Such coloration is usually caused by tannins that are released by materials such as driftwood, peat, or dead leaves.

In some cases, tannins are beneficial, but they can also be removed with a carbon filter if you prefer to get rid of them.

When UV Sterilizes Should Never Be Used: Cycling a New Aquarium

The one instance where UV sterilizers could prove truly detrimental is when a new aquarium is being cycled.

During cycling, beneficial nitrifying bacteria are busy reproducing and spreading themselves around the aquarium. Not only do they take up residency in your filter, but they also proliferate in the tank’s gravel, and even among rocks and plants.

Since the UV light will sterilize any nitrifying bacteria that are suspended in the water and passing through it, it should always be switched off until the bacterial colonies are firmly established and the tank is fully cycled.

The Pros of Using UV Sterilizers

• Clears green water by combating algae and cyanobacteria in the water column
• Clears cloudy water by reducing bacterial blooms in the water column
• Reduces the number of active pathogens such as bacteria, parasites, fungi, and viruses that are suspended in the water
• Motorized models increase water circulation and potentially aeration, too
• Usually quiet and discreet

The Cons of UV Treatment in Fish Tanks

• Extra investment and increased electricity costs
• Bulbs need replacing every 6-24 months (typically around 9 months) if the unit is left on and some models don’t feature replaceable bulbs
• Doesn’t treat algae and pathogens that are adhered to the rocks, plants, glass, or gravel
• May prove ineffective if bulbs are not strong enough or water passes through the unit too quickly

Featured Products

As we’ve already discussed, UV sterilizers either come as stand-alone units or are attached to an existing canister filter. Here we take a closer look at popular models of each kind that have been receiving the most positive reviews from customers.

COODIA Internal Green Water Killer Aquarium Filter Tank U-V Pump

If you want to try a UV sterilizer without breaking the bank, this handy little standalone unit offers a great solution. While much cheaper than models from big brands, customers of the COODIA ‘Green Water Killer’ report equally high satisfaction rates.

The unit runs on just 5 watts of electricity, meaning it’ll add very little to your electricity bill. Handy features like an optional air intake/bubbler and LED light to indicate when the UV bulb needs replacing shows thoughtful design, too.

Suitable for saltwater and freshwater tanks, many customers confirm that it can clear up green water in 3-7 days. While the manufacturers claim it can handle tanks of up to 75 gallons (more than many of its competitors), some users with larger tanks have reported it less effective.

What we like:

• Very inexpensive
• Mostly upbeat reviews suggest the unit is effective in most situations
• Very low 5-watt energy consumption
• Optional air intake allows for increased aeration
• Indicator light signals time for bulb replacement

What we don’t like:

• Equipment from lesser-known brands is sometimes less reliable
• Some customers have reported faulty parts
• Customers with tanks over 50-gallons sometimes report ineffective performance

Fluval In-Line UV-C Clarifier

An efficient passive UV sterilizer from a trusted brand, the Fluval In-Line Clarifier has been designed to attach to canister filters with 5/8” (16 mm) hosing.

As you’d expect from Fluval, the model features innovative technology such as CCFL (Cold Cathode Fluorescent Light) technology that runs cooler than traditional UVC bulbs and lasts up to 30,000 hours (3X longer).

Most customers report high levels of satisfaction with performance and the 2-year warranty offers reassurance that the unit has been made to last.

Important: Please check your canister filter’s hosing diameter is compatible before purchasing, as some models such as the Fluval FX series feature incompatible hosing!

What we like:

• Fluval is a veteran brand renowned for solid workmanship and products you can trust
• Good reviews suggest this sterilizer is effective for a wide variety of applications
• Compact design means the unit is discreet and takes up little tank space
• A 2-year warranty for defective parts and workmanship gives extra confidence in product quality

What we don’t like:

• While the UV bulb is long-lasting, it can’t be replaced
• Not compatible with all sizes of canister filter hosing

Alternatives to UV Treatment

The most common reason for people installing a UV filter is to clear up green or cloudy water, but for that job, other alternatives can be equally effective and sometimes even longer lasting.

Better Tank Maintenance

Green or cloudy water in aquaria usually indicates poor water quality that has become too high in nutrients.

When uneaten fish food, dead leaves, algae, and fish waste break down, nitrates and phosphates are released into the water which causes algae and bacteria to bloom. While UV sterilization might help to reduce the symptoms, it’s much better to tackle the root cause of the problem.

Here’s our quick list of tank maintenance basics for keeping water quality and water clarity consistently high:

Reduce Feeding

Because uneaten fish food and excessive fish waste are such major causes of poor-quality water that becomes cloudy, it’s imperative to avoid overfeeding. Indeed, overfeeding is one of the leading causes of poor water quality and fish health issues, especially for beginners.

To overcome this unnecessary issue, never feed more than your fish can eat within 2 minutes. Clean up any leftover food before it begins to break down and foul your water.

Carbon Filtration

You may have noticed that many aquarium filters on the market feature carbon filtration, but not all aquarists are well-versed in what that means.

Typically, carbon filtration refers to a filter compartment that houses small pieces of activated carbon, also known as activated charcoal. As water passes through the carbon, its sponge-like structure effectively draws out very small impurities that other types of filter media miss.

By reducing small particles, tannins, and certain dissolved nutrients in the water such as phosphates, carbon filters remove the food that problematic algae and bacteria thrive on, effectively reducing their numbers within days.

While results may not be as fast or dramatic as UV sterilization, when combined with good tank maintenance, carbon filters will usually help your water to remain crystal clear in the long run.

The Downsides of Carbon Filtration

If you do decide to install a carbon filter, just be warned that some of the nutrients it filters out are also necessary for plant growth. Phosphates, in particular, are very important for healthy plant growth, meaning that some planted aquarium enthusiasts avoid carbon filtration altogether.

Additionally, carbon will also filter out many types of fish medication as well as tannins from the water. So, if you are attempting to medicate your fish or aiming to create amber-colored, tannin-filled water, carbon filtration isn’t an option.

Conclusion – Do You Need a UV Sterilizer?

After weighing up the pros and cons of UV sterilizers, what’s the verdict? We conclude that most aquarium owners don’t need a UV sterilizer, but some might find one useful.

With proper tank maintenance and the option of carbon filtration, most aquariums should retain clear water, free from excessive algal or bacterial blooms – which renders UV sterilization unnecessary.

On the other hand, if you’ve tried everything else and are still having difficulties in achieving clear water, you could give one a try. UV treatment may be especially appropriate for those who want crystal-clear water without having to use a carbon filter.

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When it comes to cichlid tanks, most people prefer to create a natural-looking tank that resembles their natural environment. A few hobbyists and professionals, however, are choosing bare-bottom tanks instead of substrate.

So what are the pros and cons of bare-bottom tanks? Should you be trying them out? That depends on your priorities, so let’s take a closer look.

The Advantages of Bare-Bottom Tanks

Easier To Clean

The primary reason that some aquarists opt for bare-bottom tanks over substrate is that they believe they’re easier to clean.

With no sand or gravel in the way, the fish keeper can easily hoover out any uneaten food, fish waste, and debris with a siphon. This is deemed especially important in breeding tanks where it’s important to maintain hygienic conditions to prevent disease and water poisoning.

Because certain pathogens can hide in sand and gravel, some people conclude that going bare-bottom will reduce their numbers. On the other hand, others report that harmful bacteria can build up on the glass bottom without substrate.

As with many aspects of this topic, it depends on who you ask!

Prevents Digging

Some aquarists avoid substrate simply to prevent their cichlids from digging and causing a mess.

Many cichlids indeed love to dig. At the very least, cichlids like convicts and firemouths that spawn in the substrate will dig a breeding pit, but others like eartheaters will root around in the substrate night and day, both for breeding and feeding!

Some cichlids have a strong preference for a sandy bottom, but sand particles can also easily get stirred up and trapped in the tank’s filter. Even when digging in gravel, cichlids can uproot aquatic plants and make a mess.

Removing substrate entirely does of course prevent the fish from digging, but remember that this is part of their natural behavior that they might miss if left bare bottom.

Less Investment

While gravel and sand aren’t expensive, some aquarists are looking to cut corners wherever they can. Especially when setting up large fish rooms, the amount of gravel or sand required can be quite substantial.

While it may appear to be cheaper to go without substrate, it’s worth remembering that some cichlids are less likely to breed on a bare-bottomed tank, meaning the saving won’t pay off!

The Advantages of Substrate

Visual Appeal

One of the biggest reasons that most aquarists prefer tanks with substrate is that it’s visually appealing. While bare-bottomed tanks are likened to a zoo cell with a concrete floor, sand or gravel offers a more natural-looking aesthetic.

Avoid Reflections on the Bottom of the Tank

People who try bottomless tanks don’t always realize that they will constantly see reflections of their fish on the tank floor.

Not only can this be distracting, but the reflections also water down the vivid colors of their fish. In contrast, different shades of sand or gravel can be used to enhance fish colors rather than dilute them.

Fish Prefer It

A very convincing reason for adding substrate is that fish probably prefer it.

In aquarium design, we’re constantly trying to replicate the habitats that fish come from in the wild. Not only does this offer authentic scenery to enjoy a certain type of fish, but it’ll do wonders to help your fish feel at home.

Fish that feel comfortable in their surroundings are far less likely to become stressed, disturbed, and sick compared to those in an alien environment.

Considering that most cichlid species enjoy digging in the wild, a sand or gravel bottom that allows them to enjoy this natural behavior only seems fair to the fish.

Rooting Medium for Plants

While some cichlids like East African types and Oscars can’t easily be kept with plants, many others love to dwell in heavily planted tanks and look even more impressive when immersed in swathes of dense foliage.

South American cichlids like discus, severums, and angelfish in particular, love planted tanks and the presence of live plants may even improve their health, vitality, and vivid colors.

Because most plant species need to be anchored in sand or gravel, installing substrate opens up far more options in the diversity of plants you can grow.

A Medium for Beneficial Bacteria

A slightly less obvious reason that substrate is useful is to host beneficial bacteria.

If you’ve been in the hobby for a while, you’ll likely know that nitrifying bacteria that convert harmful ammonia into nitrates are essential to keep your tank healthy.

While most people know that these bacteria live within their filter, less realize that their tank’s substrate is also heaving with these helpful critters! By including sand or gravel, you’re increasing the living habitat for them which could come in especially useful if your filter fails!

Bare-Bottom vs Substrate Cichlid Tanks FAQs

Do Bare-Bottom Tanks Require Décor?

While it’s less easy to plant bare-bottom tanks, they shouldn’t be left without décor altogether!

Remember that cichlids love to hide, so some floating plants, rocks, and driftwood are still very welcome to help them feel secure.

At the very least, some pieces of PVC pipe will offer the fish somewhere to hide, even if they look terrible!

Can I Place Rocks Directly on the Glass of a Bare-Bottom Tank?

Unless your rocks have incredibly smooth bottoms, they should never be placed directly on the tank’s glass. As many aquarists will regretfully tell you, any slightly jagged edge of a rock can crack aquarium glass when placed in direct contact.

Fish keepers have come up with different ways to protect glass from rock edges. From filter pads to rings of PVC piping, to egg boxes, aquarists have come up with some clever ways to cushion the bottom of their aquariums from the unthinkable crack.

Alternatively, lightweight PVC offers another option for hiding places if you can bear the sight of it.

How Do I Keep Gravel Clean?

Because some aquarists are opting for bare bottom tanks over substrate purely for the convenience of cleaning, it’s worth pointing out here how easy it is to clean gravel.

While sand is a little bit more tricky to clean without sucking up the particles, gravel can easily be cleaned with an aquarium vacuum cleaner.

We’ve made very simple versions with a plastic soda bottle cut in half, and attached to a hose pipe, but there are many purpose-made aquarium vacuums on the market, too.

Conclusion

You’ve probably guessed by now that in general, we’re bigger fans of tanks with substrate than bare-bottom tanks!

Not only does a sand or gravel bottom look better, but they also offer your cichlids a place to dig, help them to feel at home, and allow you to grow a wider range of plants.

On the other hand, it must be remembered that some fish breeders still prefer bare-bottomed tanks for the conveniences that they claim they offer. To look into the nuances of the argument further, take a trip to an aquarium forum where the issue is hotly debated!

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When it comes to stocking your aquarium, fish often steal the spotlight, and there are certainly some beautiful species to choose from. However, a whole world of fascinating invertebrates is also waiting to be discovered, so you don’t have to limit your aquatic pet choices to fish!

From quirky shrimp to amazing, mesmerizing cephalopods, these creatures can add an exciting and unique element to your tank. And these amazing animals aren’t limited to marine and reef tanks; there are freshwater species, too.

Here are seven unusual invertebrates you might like to consider for both freshwater and saltwater aquariums.

Key Takeaways

• Invertebrates like Vampire shrimp and Thai Micro crabs make excellent freshwater pets due to their peaceful nature, interesting feeding behaviors, and tank-cleaning abilities, suitable for community aquariums of 20 gallons or more.
• Saltwater invertebrates, such as Peacock Mantis shrimp and Harlequin shrimp, offer eye-catching visuals and unique behaviors but require species-specific tanks and careful attention to dietary needs, starting at 20 gallons.
• Highly specialized and visually stunning pets like the Blue Ring octopus and Flamboyant cuttlefish are recommended for experienced aquarists. Due to their complex care requirements, these creatures require a minimum of 30-gallon aquarium and a species-only tank setup.

Summary Table

Here’s a quick, at-a-glance summary of the critters we’ve included in this article! Do bear in mind that some of these aquatic animals have complex care requirements, so be sure to research your chosen species thoroughly before taking it on.

Freshwater Options

First of all, let’s take a look at some of the most interesting, quirky freshwater creatures you might fancy keeping as pets.

Vampire Shrimp (Atyopsis moluccensis)

If you’re an experienced aquarium owner looking for an interesting addition to your tank, you might want to consider taking on Vampire Shrimp.

These fascinating creatures are native to the tropical waters of Southeast Asia. These strange little shrimp are great fun to watch as they position themselves on vantage points around the aquarium, using their feathery appendages to filter tiny particles of food from the water.

Vampire shrimp are peaceful creatures that spend most of their time perched on driftwood or rocks, making them a great addition to a community tank with other peaceful fish that won’t bother them. As mentioned above, these shrimp are filter feeders but will also eat sinking pellets and algae wafers. If you’re planning to keep these shrimp, you’ll need a minimum tank size of 20 gallons.

Vampire shrimp are not only interesting to watch, but their unique appearance and peaceful nature make them an excellent addition to any aquarium.

Thai Microcrab (Limnopilos naiyanetri)

Thai Microcrabs can make a cute, unique addition to any densely planted aquarium.

Despite their diminutive size, these fascinating crabs are extremely active and highly entertaining to watch, spending much of their time scavenging for food and climbing on plants and your aquarium decorations. They are omnivorous and will happily eat algae, detritus, and leftover fish food, making them great for keeping the tank clean and tidy.

Thai microcrabs are benign creatures and can be kept with other peaceful fish and shrimp species, and with a minimum tank size requirement of just 5 gallons, they are perfect for nano tanks. Their quirky behavior and small size make Thai Microcrabs a popular choice for aquarists looking to add an unusual element to their aquarium.

Freshwater Pom-Pom Crab (Ptychognathus barbatus)

Freshwater pom-pom crabs are unique, fascinating creatures that can add an interesting dimension to any freshwater aquarium.

These crabs are native to Southeast Asia and are best known for their oversized claws, which are covered in small hairs resembling pom-poms. Pom-pom crabs are relatively peaceful but can be territorial, so keeping them with peaceful fish and shrimp species is important.

Freshwater pom-pom crabs are omnivorous and will eat algae, detritus, and sinking pellets, making them an excellent addition to any aquarium cleanup crew. With a minimum tank size requirement of only 10 gallons, these crabs are also suitable for nano tanks.

Their quirky appearance and interesting behavior will make Pom-pom crabs an eye-catching addition to your freshwater tank. In addition, these creatures are relatively low maintenance and are sure to grab the attention of anyone admiring your aquarium.

If you’re looking for a unique and unusual aquatic pet, a freshwater pom-pom crab might just be the perfect addition to your freshwater tank.

Saltwater Aquarium Options

If you have a reef or marine aquarium of a decent size, you have a good selection of invertebrates to choose from. However, some of these critters have quite complex care needs and are best suited to experienced aquarists.

Peacock Mantis Shrimp (Odontodactylus scyllarus)

Peacock mantis shrimp are amazing creatures that are found in the Indo-Pacific region. They are known for their powerful claws, which they use to crack open the shells of their prey.

These shrimp are highly intelligent creatures with excellent eyesight, making them skilled hunters. Although they might not be suitable for life in community tanks, peacock mantis shrimp are extremely interesting to watch. Their brightly colored appearance and unique behavior make them a truly captivating addition to a marine aquarium.

Peacock Mantis shrimp are carnivorous, feeding on a variety of meaty foods, such as fish, crustaceans, and mollusks. For that reason, you should keep your shrimp in a species-only tank, as they are aggressive and can harm other tankmates.

If you plan on keeping peacock mantis shrimp, you’ll need a minimum aquarium size of 30 gallons.

Harlequin Shrimp (Hymenocera elegans)

Harlequin shrimp are an exquisite addition to any aquarium due to their unique feeding habits and striking appearance.

Originating from the Indo-Pacific, these shrimp have specialized claws that they use to flip over and consume the tube feet of starfish, making them obligate starfish eaters. Due to their specific dietary requirements, Harlequin shrimp are best kept in a species-only tank or with peaceful tankmates who won’t be viewed as food.

Harlequin shrimp are relatively low maintenance once their dietary needs are satisfied, and their minimum tank size requirement is just 20 gallons. These shrimp are visually stunning, and their feeding behavior is fascinating to watch, making them an excellent choice for experienced aquarists looking for a unique addition to their marine aquarium.

Blue Ring Octopus (Hapalochlaena sp.)

Before introducing our next enchanting sea creature, a word of warning. Blue Ring octopuses are highly venomous and should only be kept by experienced aquarists.

These enigmatic creatures are native to the Indo-Pacific regions and spend much of the day hiding in caves or crevices, only becoming active at night. Because of their venomous qualities and aggressive nature, Blue Ring octopuses should be kept in a species-only tank.

These creatures are carnivorous and will eat a variety of meaty foods, including small fish, shrimp, and crabs. If you’re an experienced aquarist looking for an intriguing, unique addition to your saltwater tank, a blue ring octopus might be just what you’re looking for.

These highly intelligent creatures have captivating behaviors that make them a joy to watch, but a 30-gallon, single-species tank is essential to keep them healthy and happy.

Flamboyant Cuttlefish (Metasepia pfefferi)

The Flamboyant cuttlefish certainly lives up to its common name, and if you’re looking for a visually stunning and fascinating invertebrate to add to your aquarium, this creature is an excellent choice.

These cuttlefish are found across the Indo-Pacific regions and are well-known for their amazing, vibrant colors and unique swimming style. What’s even more impressive is their ability to change color and texture to blend in with their surroundings, making them incredibly interesting to observe in your aquarium.

However, it’s important to note that Flamboyant cuttlefish must have a species-only tank or a few peaceful tankmates that won’t harm them. These glamorous critters are carnivorous and will eat a variety of meaty foods, including shrimp, fish, and crustaceans, which is another reason a species-only tank is a good option for these guys.

As with many of the invertebrates we’ve featured in this guide, the Flamboyant cuttlefish has specific dietary needs, so it’s essential to research their requirements before taking them on.

In terms of tank size, a minimum of 30 gallons is recommended for these creatures. Once their needs are met, the Flamboyant cuttlefish is relatively low maintenance and can make a great addition to your aquarium. Their unique behavior and stunning appearance are sure to captivate the attention of any onlooker.

If you’re an experienced marine hobbyist looking for a unique and visually striking invertebrate to add to your collection, the Flamboyant cuttlefish is definitely worth considering.

Final Thoughts

Whether you have a freshwater or saltwater tank, introducing a few of the unique inverts we’ve featured in this guide can provide endless fascination for you and your visitors!

However, many of these weird and wonderful creatures have very specific care requirements, so please remember to research each species carefully to ensure they are compatible with your aquarium environment and you can meet their specific needs for a long, happy, and healthy life.

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Although caring for marine fish can be challenging, they are undoubtedly among the most colorful aquatic creatures you can keep as pets, turning your marine or reef tank into a vibrant underwater paradise.

Here are six stunning, reef-safe species guaranteed to make your tank pop!

Key Takeaways

• Caring for marine fish like the Mandarinfish and Royal Gramma involves providing an environment with plenty of live rock and hiding spots and a diet suited to their carnivorous needs; they also display unique behaviors such as changing colors and complex mating dances.
• Flame Angelfish and Moorish Idols are vibrant and active fish that need spacious tanks and a balanced diet but are territorial; Flame Angelfish are suitable for reef aquariums, while Moorish Idols are better for experienced aquarists.
• Regal Angelfish and Powder Blue Tangs require meticulous care, especially regarding their diet and tank environment. They can be aggressive toward similar fish, so it’s recommended to introduce Powder Blue Tangs to the tank last to minimize aggression.

Summary Table

Here’s an at-a-glance overview of all the colorful fish species we’ve featured in this article!

Please note that the water parameters provided are general ranges suitable for most marine fish. Specific care might require slight adjustments within these parameters. Lifespan and cost can vary based on several factors, such as the fish’s origin, size, and overall health when acquired.

Mandarinfish (Synchiropus splendidus)

The Mandarinfish, also known as the Mandarin dragonet, is one of the most beautiful and popular species of marine fish in the hobby.

These small, peaceful fish are native to the Pacific Ocean and are famous for their vibrant colors and unique patterns. They are a popular choice for reef aquariums and do best when kept in well-established tanks containing plenty of live rock and hiding spots, as they prefer to spend most of their time hiding out in crevices and caves.

Mandarinfish are carnivorous and feed primarily on small crustaceans and copepods, making them a perfect addition to a mature reef tank with an established population of these organisms. These fish need a well-balanced diet and need multiple daily feeds to keep them healthy.

Mandarinfish are not just pretty to look at; one of the most fascinating things about them is their mating behavior. During the breeding season, males perform an intricate courtship dance to attract a female, and the pair will then rise up into the water column to release their eggs and sperm.

However, breeding Mandarinfish in captivity can be extremely difficult and is usually only achieved by experienced hobbyists or commercial breeders. Overall, Mandarinfish are an excellent addition to any marine aquarium due to their mesmerizing appearance, peaceful nature, and fascinating behavior.

Royal Gramma (Gramma loreto)

The Royal Gramma, also known as the Fairy Basslet, is a species of fish native to the Caribbean Sea and western Atlantic Ocean. Aquarists prize this fish for its striking purple and yellow coloration, which makes it stand out in any marine aquarium.

Despite their vibrant appearance, Royal Grammas are relatively hardy and adaptable, making them ideal for both beginner and experienced aquarists. These fish are naturally peaceful characters that can coexist with a variety of tankmates, including other small fish and invertebrates. This makes them an excellent choice for community reef aquariums.

Royal Grammas prefer aquariums with plenty of rocky caves, crevices, and overhangs where they can retreat when feeling threatened. These fish are known to be territorial and will defend their favorite hiding spots against other fish, so it’s important to provide ample hiding places for each individual fish in the tank.

In terms of diet, Royal Grammas are strict carnivores and will thrive on a diet of meaty foods, and are especially partial to mysis shrimp and brine shrimp. They should be fed small amounts several times a day, rather than one large portion, to prevent overeating and digestive problems that could result.

One interesting behavior of Royal Grammas is their ability to change color depending on their mood. When feeling stressed or threatened, they often darken their coloration to blend in with their surroundings and avoid attracting attention. But when feeling relaxed and comfortable, they display their vibrant colors to full effect. That can be a handy barometer for their owners, enabling them to tell whether the conditions in the tank are correct for these fish.

Flame Angelfish (Centropyge loriculus)

Flame Angelfish are tropical marine fish native to the Indo-Pacific region, including the Red Sea and the Great Barrier Reef. These fish are popular among aquarium hobbyists for their stunning orange-red coloration and unique markings, which make them stand out in any marine aquarium.

In addition, these glorious marine fish are relatively easy to care for and can adapt to a wide range of water conditions. Ideally, you need a tank with a minimum capacity of 55 gallons for Flame Angelfish. They are reef-safe, coexisting peacefully with corals and other invertebrates without causing any damage.

When it comes to diet, Flame Angelfish are primarily herbivores, requiring a diet rich in algae for optimal health. They also appreciate a variety of frozen and live foods, such as brine shrimp, krill, and mysis shrimp, which gives them all the nutrients they need.

Flame Angelfish are quite lively and active and can be pretty territorial, especially towards other fish of the same species or similar appearance. Therefore, it’s best to keep them in a species-specific tank or with other peaceful fish that won’t compete for resources.

Moorish Idol (Zanclus cornutus)

Moorish Idols are striking fish found in the Indo-Pacific region. They are instantly recognizable by their amazing black, white, and yellow coloration, which makes them extremely popular among marine aquarium enthusiasts.

Despite their delicate appearance, Moorish Idols are relatively hardy and can adapt well to aquarium life. However, they require a large tank with plenty of swimming space and hiding spots.

These fish are known for their unique body shape and elongated dorsal fin, which can be up to two-thirds the length of the creature’s whole body. This fin is used for communication and display, making it an important part of the Moorish Idol’s courtship behavior. In the wild environment, you generally see these fish in pairs, so it’s best to replicate that in the aquarium if you can find a mated pair. Although not particularly aggressive, these fish can be territorial and feisty toward their tank mates.

Moorish Idols are omnivores and feed on a variety of plant matter, algae, and small invertebrates in the wild. In an aquarium setting, they should be fed a diet that includes both plant matter and protein-rich foods like brine shrimp and krill. It is important to ensure they receive a balanced diet to maintain their health and vitality.

These elegant fish make a fabulous addition to a large marine tank. However, they are unsuitable for novice aquarists and require significant care and attention to thrive in captivity.

Regal Angelfish (Pygoplites diacanthus)

Regal Angelfish are native to the Indian and Pacific Oceans, where they inhabit coral reefs and lagoons.

They are popular and highly sought-after fish with stunning blue and yellow coloration, which makes them an exquisite addition to any aquarium. However, the Regal Angelfish is not recommended for beginners because of its very specific care needs.

These fish need a well-established marine aquarium with lots of live rock and hiding places where they can feel safe and protected. This is because Regal Angelfish are naturally shy and prefer to spend much of their days hiding in rocky overhangs, crevices, and caves.

The Regal Angelfish eats both algae-based foods and meaty treats. One thing that makes these fish tricky to keep in captivity is their picky eating habits, and they often take a while to adjust to their new surroundings and food. It’s typically best to offer a few small feeds throughout the day rather than one large feed.

Regal Angelfish can be aggressive towards their tank mates, especially if they are of a similar size or color. Therefore, we recommend keeping them with other peaceful species that won’t compete for food or territory.

Powder Blue Tang (Acanthurus leucosternon)

The Powder Blue Tang is a fascinating fish species from the Indo-Pacific region’s warm waters.

These fish are known for their stunning powder blue coloration and distinctive yellow dorsal fin, making them a favorite among many marine enthusiasts. Powder Blue Tangs are best suited for large, well-established reef aquariums with plenty of swimming space.

These fish are herbivores and require a diet rich in algae and seaweed. They should be fed at least three times a day to ensure that they receive all the nutrients they need to thrive. When it comes to water conditions,

It is important to note that Powder Blue Tangs can be aggressive towards other tangs, so they are recommended to be kept as the only tang in the aquarium. However, they are generally peaceful towards other tankmates and can be kept with a variety of other fish species as long as they are not aggressive towards them.

Powder Blue Tangs are active swimmers and require plenty of open swimming space unobstructed by hardscape and decorations. If you are considering adding a Powder Blue Tang to your aquarium, it is important to bear in mind that these fish can grow up to 10 inches in length. Therefore, you must provide them with a large enough tank to accommodate their size. Additionally, most experienced keepers recommend that you introduce this species to the aquarium last to reduce the risk of aggression towards other tankmates.

Final Thoughts

Adding any of these spectacular saltwater fish to your aquarium is sure to impress and delight your friends when they call around to view your tank.

However, many of these fish species have very specific care requirements, which makes them unsuitable for novice hobbyists. In addition, most of these fish are super-expensive to buy, so you must be confident you can provide your chosen species with everything it needs to thrive before you part with your cash.

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