10 Of The Best Fish For A Hexagon Tank!

Suitable fish for hexagon tanks include corydoras, guppies, small gourami, bettas, and kuhli loaches.

Although hexagon tanks used to be very niche, they are becoming increasingly popular so I wanted to publish this article going over the best fish for a hexagon tank to help my readers stock their aquariums.



Corydoras are one of the best fish for hexagon tanks and can work well in most setups.

These little guys are bottom-dwelling fish and usually stick to the bottom third of your aquarium. This makes it easy to add surface-dwelling fish to the tank without issue.

A wide range of corydoras are in the hobby but smaller pygmy corydoras are a great option for 15-20 gallon hexagon tanks. The larger types of corydoras will need a 29-gallon hexagon tank or larger but this tank size is quiet common.

Corydoras will forage for food on the substrate of your tank moving in random directions usually changing every few seconds.

This makes them an ideal fit for a hexagon tank as they don’t seem to care about long lengths of horizontal swim space.

I have never seen my corydoras act aggressively towards the fish in their tank making them an excellent option for community tank setups.



Guppies can be a great option for hexagon tanks and work well in popular tank sizes.

People often say guppies only stick to the top quarter of the water column in their aquarium but this is not the case for my guppy tanks.

They usually spend around 75% of their time at the surface but they will swim in the middle and bottom layers too.

A huge range of guppy colors, patterns, and tail shapes are available helping you add a lot of variety to your aquarium.

A 5-gallon hexagon tank can be used for breeding guppies but they work in far larger tanks too. I prefer to keep all-male guppy tanks as it removes the risk of overpopulation and I usually use a tank that is at least 20 gallons for this type of setup.

Guppies work well in hexagon tanks due to swimming in all levels of the water column and adding a huge range of colors.

My male guppies can display minor aggression towards each other such as tail fanning and chasing but they never get aggressive with their non-guppy tank mates.

This means you can keep them in a hexagon community tank if you like but I love to keep them in a species-specific tank be it a guppy breeding tank or an all-male setup.

Honey Gourami

Honey Gourami
Honey Gourami

Honey gourami are an underrated fish that can thrive in most hexagon tank setups.

People often say that honey gourami are a surface-level fish but my honey gourami swim in all levels of their aquarium.

The only real drawback of honey gourami is the lack of variety in the species as they are all yellow but some males can have a touch of red on their tails.

I love honey gourami and they are one of my top three fish. I highly recommend them for beginners as they are so hardy and easy to keep.

A single honey gourami can be kept in a 5-gallon hexagon tank but honey gourami are social fish and prefer other honey gourami in their tank with them. I recommend a minimum tank size of 10 gallons for two honey gourami but they work well in larger tanks.

I have kept two males in one of my tanks and a male and female in another and there have never been any issues with aggression towards their tank mates. This makes them the perfect fish for community tanks that are 20 gallons and over.

They are a great option for hexagon tanks as they swim in all levels of the aquarium and their bright yellow color makes them stand out.

Kuhli Loach

Kuhli Loach
Kuhli Loach

Kuhli Loaches are one of the best oddball fish to keep in a hexagon tank and they will work well in most setups.

Unlike the other featured fish on the list, Kuhli Loaches have a unique appearance looking more like an eel than a fish.

They are bottom dwellers like Corydoras and will spend most of their time in the bottom third of your water column.

Kuhli Loaches are social fish so you will want to keep a minimum of six of them in your aquarium or they may hide.

There are different types of Kuhli Loach on the market but the regular striped variant is the most common and often cheap and easy to find in stores.

I wouldn’t keep these in anything less than a 20-gallon hexagon tank with a 29-gallon tank being a far better option.

Unlike most fish, Kuhli Loaches like to hide amongst roots, driftwood, and rocks in their tank so the available swim space doesn’t matter much making them great for hexagon tanks.

Kuhli Loaches are not aggressive fish making them great for most community tank setups.

Betta Fish

Betta Fish
Betta Fish

Betta fish can be a great fish to keep in a smaller hexagon tank with their hardy nature making them a great option for beginners.

People say that bettas are surface-level fish but my bettas will swim in all levels of their aquarium.

My bettas spend around half their time near the surface but the rest of the time they will happily swim in the middle and bottom layers.

One of the best things about betta fish is the huge variety the species offers. There are countless colors, patterns, and tail shapes making it easy to find the perfect betta.

Tank size is a very controversial topic for betta fish but an 8-gallon hexagon tank is the absolute minimum I would use with a betta.

Bettas can be aggressive making it difficult to keep them with other fish so you may want to keep your betta as a solo fish in your tank.

Dwarf Gourami

Dwarf Gourami
Dwarf Gourami

Dwarf Gourami can be an excellent option for the right hexagon tank setup.

Most Dwarf Gourami like to spend a large amount of their time near the surface of their tank making them a good option for tanks with bottom dwellers like Corydoras or Kuhli Loaches.

Male Dwarf Gourami can be aggressive though so I would only recommend keeping females in community tank setups.

Unlike most other species of gourami in the hobby, there is some variety in the color of your Dwarf Gourami.

You have the standard color shown in the photograph at the start of the section and the all-red or all-blue variants are cheap and easy to find.

There are also the rarer Blue Coral, Blue Rainbow, and Rainbow Flame variants of the fish but these tend to be more expensive and difficult to find in certain areas.

You can keep a single male Dwarf Gourami in a 10-gallon hexagon tank if it’s the only fish in the tank but breeding and community tank setups will usually need to be at least 20 gallons.

Remember to keep female Dwarf Gourami in community tank setups to prevent aggression. Good fish-keeping stores will easily be able to separate male and female fish to provide you with what you need.



Platies are a great option for medium-sized hexagon tanks with the fish being a great option for people wanting a lot of color in their tank.

Most platies spend around half their time in the top third of your aquarium but will swim in the middle and bottom layers.

There is a huge range of platies in the hobby and they come in a range of colors. The Mickey Mouse platies are my favorite but there are plenty of great-looking options.

Platies also come in colors that contrast well with green helping them stand out in heavily planted tanks.

I would recommend a minimum hexagon tank size of 10 gallons when keeping platies but a 20-gallon or larger will be better.

Platies will breed quickly so I recommend you stick with an all-male tank to prevent overpopulation issues in your aquarium.

If you want to breed platies, keeping one male with two females in a 10-gallon hexagon tank will work well.

Platies tend to be calm and relaxed but males can spar with each other but aggression is minimal.

Endler’s Livebearers

Endler's Livebearers
Endler’s Livebearers

Endler’s Livebearers can be a great option for hexagon tanks and their small size lets you keep lots of them without stocking issues.

Some Endlers like to stick to the surface of their aquarium but most will explore the other areas of your tank filling the tank with color.

A huge range of Endler’s Livebearers and Endler’s Guppies (Endler and guppy hybrid fish) are available. This offers plenty of color, pattern, and tail shape variation to find the perfect fish for your aquarium.

I recommend regular Endler’s Livebearers for beginners as they are hardier than Endler’s Guppies. There’s something in the genetics of Endler’s Guppies that makes them weaker and less forgiving.

The tiny size of Endler’s Livebearers is both a strength and a weakness. It’s a strength in as you can keep lots of them in a small 10-gallon hexagon tank but it’s a weakness as they can be difficult to see.

Endler’s Livebearers will breed rapidly so I recommend beginners stick with a male-only setup.

Green Neon Tetras

Green Neon Tetras
Green Neon Tetras

Green Neon Tetras are becoming increasingly popular in the hobby and can work well in medium-sized hexagon tanks.

Green Neon Tetras usually stick to the bottom half of the water column and rarely go towards the surface.

It’s important to keep this in mind as they need food to sink to their level before they can eat so surface-dwelling fish that eat a lot can be problematic so watch your fish during feeding time.

One of the main downsides of this fish is its lack of variety as all Green Neon Tetras look very similar. They look a little bland compared to neon tetras or cardinal tetras and their higher price tag of green neons puts people off getting them.

The main advantage of Green Neon Tetras is that they are tiny, similar to Endler’s Livebearers. This allows you to keep them in 20-gallon hexagon tank with minimal issues but larger tanks will be better.

Green Neon Tetras are not aggressive towards their tank mates but the males may chase each other to establish a hierarchy in your tank.

This is normal and nothing to worry about with the aggression usually calming down once a hierarchy is established.

Their peaceful nature makes them a great option for community setups in your hexagon tank.

Neocaridina Shrimp

Types Of Neocaridina
Types Of Neocaridina

Neocaridina Shrimp can be a beginner-friendly, colorful addition to most hexagon tank setups.

I’m a huge fan of shrimp keeping and I have shrimp in all of my tanks with Neocaridina being my main shrimp of choice.

Not only are they colorful but they are also easy to breed and easy to keep. Red cherry shrimp are cheap and easy to find but the other colors can be more expensive and difficult to find.

The hexagon shape of your aquarium won’t bother shrimp in the slightest as they require grazing space rather than swim space. Add some driftwood, rocks, and moss to the tank, and your shrimp will be happy and graze all day.

You can keep Neocaridina Shrimp in hexagon tanks as small as 5 gallons but larger tanks are always better.

Neocaridina Shrimp can also be kept as a tank mate for the other peaceful fish featured in this article helping you fill your tank with color and movement.