10 Of The Best Fish For A Hexagon Tank! (With Pictures)

Hexagon tanks offer a unique visual appeal for aquarium enthusiasts that makes them an increasingly popular choice for both new and experienced fishkeepers. These tanks, due to their tall and narrow design, present specific challenges in terms of stocking and maintaining the ideal environment for aquatic life.

In order to create a thriving ecosystem and maximize the potential of these interesting tanks, it’s important to choose the right species that can readily adapt to the vertical space.

When selecting the best fish for a hexagon tank, it’s crucial to opt for species that are comfortable with the reduced horizontal swimming space, as well as the increased water column height. Smaller, agile swimmers, such as various Tetras, Barbs, and Danios, tend to fare well in hexagon tanks due to their ability to navigate the space with ease.

Aside from the physical capabilities of the fish, compatibility with other species, and ease of care should also be considered when stocking a hexagon tank. Ensuring a harmonious blend of visually appealing, adaptable, and low-maintenance aquatic life allows both the fish and the owner to experience the maximum benefits and enjoyment of such an unconventional tank layout.

Hexagon Tank Vs Rectangular Tank

Hexagon Tank Vs Rectangular Tank

When discussing aquariums, hexagon tanks and rectangular tanks each have their unique attributes. Both styles offer a home to various fish species, but there are pros and cons to each type of tank setup.

One of the key differences between hexagon tanks and rectangular tanks is the surface area. Rectangular tanks typically provide more surface area compared to hexagon tanks of the same volume. This results in increased gas exchange, promoting healthier fish conditions as it allows for more oxygen to enter the water.

In terms of aesthetics and space constraints, hexagon tanks can be an appealing option as they offer a distinctive look and can fit into corners or limited spaces with ease. They also provide a unique perspective on the aquatic life within, emphasizing the vertical aspect of the tank and creating interesting visual effects with decorations and plants.

A tiger barb swimming around its aquarium

However, a hexagon tank’s unusual shape might pose challenges when it comes to selecting compatible fish species. Due to the decreased surface area and limited horizontal swimming space, some fish may not thrive as well in a hexagonal environment.

Fish that are more comfortable in hexagon tanks include Tetras, Barbs, smaller Cichlids, Danios, Catfish, Rainbowfish, and Gouramis.

On the other hand, rectangular tanks, with their expanded surface area and horizontal swimming space, tend to accommodate a broader range of fish species. They also offer more options for aquascaping and creating intricate environments that cater to the needs of both active and passive fish.

When selecting between a hexagon tank and a rectangular tank, consider the available space, desired aesthetics, and the specific needs of your chosen fish species.


Betta fish in a hexagon tank

Bettas are beautiful and popular fish, known for their vibrant colors and graceful movements. When considering a hexagon tank for Betta fish, one should be mindful of the tank size, water parameters, and aquascaping, as these factors can greatly impact the health and well-being of your fish.

Hexagon tanks can provide an attractive and unique display for Bettas, but as we covered in our betta fish care guide, tank size is crucial to ensure the fish has enough space to move and explore. While Bettas can survive in tanks as small as 5 gallons, larger aquariums are recommended. A hexagon tank should ideally be at least 10 gallons or more for a betta, especially if you plan on adding tank mates.

Water parameters for Betta fish, including temperature, pH, and hardness, should be carefully monitored to maintain a healthy environment. Bettas thrive in water temperatures between 78 and 80°F, with a pH level between 6.8 and 7.5. Soft to moderately hard water is best, with a general hardness of 3 to 5 dGH.

A betta fish in its tank relaxing

Regular water changes and testing should be performed to ensure optimal water quality. We usually recommend that you change 10-20% of the tanks water each week but this can change depending on the total bioload of your hexagon tank.

When it comes to aquascaping, Bettas appreciate a well-planned environment with plenty of places to hide and explore. Utilize live or silk plants to provide shelter and structure, helping reduce stress and aggression.

Additionally, soft substrates like sand are preferred, as Betta fish often enjoy resting on flat surfaces at the bottom of the tank. Floating plants can also be added to create shady areas and allow male betta fish to build bubble nests, giving the tank a more natural look and encouraging breeding behaviors.

Ultimately, providing a hexagon tank with the right conditions will allow your Betta to thrive, showcasing its natural beauty and captivating personality to the delight of any aquarist.

An infographic going over a BETTA FISH CARE sheet


Guppies swimming in their tank

Guppies are a popular choice for hexagon tanks due to their adaptability, vibrant colors, and active nature. They are small, peaceful fish that can coexist with various tank mates, making them an ideal addition to a diverse aquatic community. Here, we will briefly discuss guppies’ ideal tank size, water parameters, and aquascaping requirements but we go into far more detail in our guppy care guide.

A hexagon tank with a capacity of around 10 to 20 gallons suits guppies well; however, larger tanks offer more space for swimming and better water quality. Keep in mind, overcrowding can lead to stress and lowered immunity, so ensure a suitable tank size for the number of guppies you intend to house.

Guppies thrive in the following water parameters:

  • Water Temperature: 72-82F
  • Water Flow: Still-Low
  • pH: 7-8
  • GH: 8-12 dGH
  • KH: 4-8 dKH
  • Ammonia: 0 ppm
  • Nitrite: 0 ppm
  • Nitrate: <10 ppm

It is important to maintain these conditions, as guppies can become susceptible to disease when exposed to constant water parameter fluctuations.

A guppy swimming in its tank

Aquascaping plays a crucial role in creating a comfortable and visually appealing habitat for guppies. Make sure to include:

  • Plants: Guppies find comfort in having plants in their tank. Live plants like Java moss, Anubias, and Hornwort provide shelter and a source of concealment for guppies. These plants also aid in maintaining stable water conditions.
  • Decorations: Incorporating rocks, driftwood, and caves gives guppies structure and hiding spots. Make sure the decorations do not have sharp edges that could injure the delicate fins of the guppies.
  • Open space: Guppies are active swimmers and enjoy having open areas for swimming. Ensure there is enough room for them to display their vibrant colors and engaging behavior.

In summary, guppies are an excellent choice for a hexagon tank due to their adaptability, compatibility with other community fish, and relatively simple care requirements. Providing a suitable environment that meets their tank size, water parameter, and aquascaping needs will ensure a healthy and eye-catching addition to your aquarium.

An infographic going over a guppy care sheet


A school of tetras in their tank

Tetras are small, peaceful, and colorful tropical fish that make an excellent addition to hexagon tanks. They come from various regions, such as South America, Central America, and Africa. These schooling fish are compatible with a diverse range of tank mates and are well-suited for community aquariums.

Tank Size: Tetras generally do well in smaller tanks due to their size, which makes them ideal for hexagon-shaped tanks. A minimum tank size of 10 gallons is required with larger tanks usually being better.

Due to being a schooling fish, you will usually need to keep a minimum of six tetras in your tank. Depending on the tank setup, you are able to keep some types of tetra, such as ember tetra with betta fish that we mentioned earlier in the article.

Here are some popular tetra species that can work in a hexagon tank:

  1. Neon Tetra (Paracheirodon innesi): They are colorful and one of the most popular tetras. They prefer softer water and a pH of 6-7.
  2. Cardinal Tetra (Paracheirodon axelrodi): They look similar to neon tetras but have a longer red stripe. They prefer a slightly acidic pH.
  3. Rummy-nose Tetra (Hemigrammus rhodostomus): Recognized by their distinctive red noses and stripy tails.
  4. Ember Tetra (Hyphessobrycon amandae): Their bright ret color really does pop against the green of any plants in their tank making them a great option.
  5. Black Neon Tetra (Hyphessobrycon herbertaxelrodi): They are not colored like the regular neon tetras but have a unique black and white horizontal stripe.
  6. Lemon Tetra (Hyphessobrycon pulchripinnis): They have a light yellow body with bright yellow fins.
Different types of tetra that can thrive in a hexagon tank
Different Types Of Tetra That Can Thrive In A Hexagon Tank

Water Parameters: These hardy fish can adapt to various water parameters, but it is essential to maintain a stable and clean environment for their optimal health. Most tetras prefer soft to moderately hard water, with a pH range of 6.8 to 7.8. To prevent stress and diseases, maintain a consistent water temperature between 75°F and 80°F as it suits most tetra species.

Aquascaping: Tetras thrive in well-planted tanks that imitate their natural habitats. A mix of live plants, like Java moss, Anubias, and Pennywort, creates a beautiful landscape while providing hiding spots and reducing stress. Floating plants can create shaded areas, which gives the tetras a sense of security. Additionally, using driftwood and smooth rocks can enhance the visual appeal of the hexagon tank while enriching the environment for the tetras.

In summary, tetras are attractive, low-maintenance fish perfect for hexagon aquariums. By ensuring an appropriately sized tank, maintaining optimal water parameters, and creating a visually appealing aquascape, tetras will create a lively and colorful aquarium that can be enjoyed by both beginners and experienced fishkeepers.


Platies swimming in their tank

Platies are a popular choice for hexagon tanks due to their small size, peaceful temperament, and ease of care. They come in a variety of colors, which can add a lively, vibrant touch to any aquarium setup.

An appropriate tank size for a group of platies would be a hexagon tank with a capacity of at least 20 gallons. This would provide them with adequate room to swim and socialize without overcrowding. When selecting a tank, ensure that the necessary equipment, such as a filter and heater, can be properly installed and positioned.

In terms of water parameters, platies are relatively hardy fish and can tolerate a range of water conditions. However, they do best when kept in water with a temperature between 75-80°F, pH levels ranging from 6.5 to 8.5, and a hardness of around 10-20 dGH. It is important to regularly monitor these parameters and perform water changes as needed to maintain a healthy environment for the fish.

Platies Swimming In Their Tank

Aquascaping plays a significant role in the well-being of platies. They appreciate a tank with a mix of live plants, rocks, and driftwood, which provide hiding spots and resting areas. Floating plants can also offer a sense of security and reduce stress levels. Be mindful not to overcrowd the tank with decor, as some swimming space should be left open for the fish to move freely.

When considering tankmates for your platies, ensure that they are compatible and peaceful species to maintain a harmonious environment. Some suitable tankmates include mollies, neon tetras, guppies, rosy tetras, and minnows.

Dwarf Gouramis

Dwarf gourami in their tank

Dwarf Gouramis are visually appealing and peaceful fish, that can work very well in hexagon tanks. These small, freshwater fish originate from Asia and come in various colors, such as blue, orange, and red.

Tank Size: As a general rule, the minimum tank size for Dwarf Gouramis should be 10 gallons, which will comfortably house two gouramis. However, a larger tank of 20 gallons or more is recommended, especially when housing multiple fish or including tank mates. Hexagon tanks not only provide ample space but also enhance the visual appeal of these vibrant fish.

Water Parameters: Dwarf Gouramis thrive in water conditions that closely resemble their natural habitat. The ideal water temperature range is between 72-82 degrees Fahrenheit. The pH should be maintained between 6.0-7.5, ensuring slightly acidic to neutral water. Regular water changes and monitoring are crucial to maintaining a stable aquatic environment for these fish.

A Dwarf Gourami in its tank

Aquascaping: To create a comfortable environment for Dwarf Gouramis, focus on aquascaping that offers hiding spots and shelter. Implementing a combination of live and fake plants can work along with driftwood or rocks.

Introducing suitable tank mates is essential for maintaining a peaceful aquarium environment, and species such as guppies, zebra danios, and tetras are good options. You can even keep a dwarf gourami with a betta in certain hexagon tank setups.

Tiger Barbs

Tiger Barbs swimming in their tank

Tiger Barbs are an eye-catching and energetic addition to a hexagonal aquarium. These fish, with their vibrant colors and playful behavior, can bring life to your tank. They also make excellent tank mates for many other fish species, as long as you take the necessary precautions to prevent fin-nipping.

Tank Size: For Tiger Barbs, a hexagonal tank of at least 30 gallons is recommended, as they are schooling fish and should be kept in a group of at least six. A larger tank size will also offer sufficient swimming space for these active fish.

Water Parameters: Tiger Barbs can adapt to a range of water conditions, but they prefer water temperatures between 77 and 82°F. Maintaining a stable pH level between 6 and 8 is crucial to their well-being. Additionally, it is important to provide them with a well-filtered and consistently clean environment to prevent stress and poor health.

A tiger barb swiming around its tank

Aquascaping: When it comes to aquascaping, Tiger Barbs enjoy a tank with plenty of hiding spots and swimming areas. You can achieve this by incorporating live plants, rocks, and driftwood into your design.

Provide dense vegetation with your plants around the edges for shelter, while allowing open swimming areas in the center. This setup will allow Tiger Barbs to feel secure and engage in their natural behaviors.

Remember to closely monitor aggression levels among Tiger Barbs since they can become territorial in limited spaces. Introducing the entire school of Tiger Barbs at once may also help establish a stable hierarchy. Taking these factors into account will ensure that your Tiger Barbs thrive in their hexagonal tank environment.


Mollies swimming around their tank

Mollies are a popular choice within the fish keeping hobby and they can work well in a number of different hexagon tank setups. They come in various shapes and colors, making them an attractive addition to any aquarium. Mollies are a peaceful and versatile species of fish, which allows them to coexist with many other species in a community tank.

Tank Size: Molly fish require a tank that holds a minimum of 20 gallons of water when kept in a hexagon tank. However, a 30 gallon tank would be a better option as it will allow you to keep more mollies in the tank.

Water Parameters: Mollies are adaptable to a range of water parameters. They prefer a temperature of 75-80°F, making it essential to have an aquarium heater to maintain the desired temperature. Mollies also appreciate higher pH, KH, and GH levels due to their high tolerance for salt. A pH level of 7.5-8.5 is ideal for their well-being.

Some mollies in a hexagon tank

Aquascaping: When setting up the aquarium for mollies, it is essential to incorporate a diverse aquascape. They thrive in an environment with plants that provide cover and shade, as well as open swimming areas for them to explore.

Mollies can coexist with various tank mates, such as guppies, platy fish, and other livebearer species, as long as they have similar water parameters and care requirements. It is crucial to research and choose suitable tank mates when setting up a community aquarium.

Zebra Danios

A Zebra Danio swimming in a tank

Zebra Danios are a popular choice for hexagon aquariums due to their hardy nature, adaptability, and small size, making them an excellent addition for tank setups with limited space. They tend to do well in tall tanks and are active and social swimmers who add a vibrant touch to any community tank.

Tank Size: When considering a hexagon tank for Zebra Danios, a minimum of 20 gallons is advised to ensure sufficient space for these lively swimmers to move around. If planning to accommodate more fish, it is important to increase the tank’s capacity accordingly.

Water Parameters: Zebra Danios can adapt to a wide range of water parameters. They thrive best in water temperatures between 64-75°F, with a pH level of 7.0-7.4. As with any species, maintaining a stable water environment through regular monitoring and maintenance ensures their optimal well-being.

A Zebra Danio in its tank

Aquascaping: In a hexagon tank, it’s essential to provide adequate places for Zebra Danios to swim freely, as they are active schoolers and usually need to be kept in groups of at least six. You can add plants, rocks, and driftwood at the rear of the tank if needed but always ensure there is plenty of swimming space.

When choosing tank mates for Zebra Danios, it’s crucial to select species that are peaceful and compatible. Some options include Cory Catfish and Ember Tetras, which are known for their docile nature and ability to enjoy a similar range of water parameters.


An Angelfish swimming in its tank

Angelfish are a popular choice for hexagon tanks as they usually do better in taller tanks than in longer tanks. These freshwater beauties are known for their tall, pointed fins and unique markings that come in many different varieties and colors.

Tank Size: Angelfish require adequate space to swim and grow so a minimum tank size of 50 gallons is recommended. Larger tanks are preferable due to the size of fully grown angelfish and their unique tall shape making space an important factor in their tank.

Hexagon tanks provide a unique vertical space for angelfish to showcase their natural height and beauty.

Water Parameters: Angelfish thrive in water with slightly acidic to neutral pH levels (6.8 – 7.8) and moderate hardness (4 – 12 dGH). They prefer a stable water temperature between 75 and 82 degrees Fahrenheit. Regular water changes and monitoring water chemistry are crucial for keeping angelfish healthy.

An angel fish in a tank with some tetras

Aquascaping: Creating a visually appealing and comfortable environment for your angelfish is important. Incorporate tall plants to mimic their natural habitat and to provide hiding spots. Driftwood and rocks can be used to create a more engaging environment but ensure they are smooth and won’t harm the fins of your angelfish.

In summary, angelfish make a captivating addition to a hexagon tank as long as their specific requirements, such as tank size, water parameters, and aquascaping, are carefully considered. Providing these elements will help ensure a thriving and attractive angelfish-filled aquarium.

Endler’s Livebearers

Endler's Livebearers living in their aquarium

Endler’s Livebearers (Poecilia wingei) are small, colorful fish native to Venezuela. They adapt well to various aquarium settings and are often mistaken for Guppies due to their resemblance. These fish are an excellent choice for hexagon tanks because they love to swim in vertical spaces often swimming to the top of their tank and down to the substrate over and over again.

Tank Size – A minimum tank size of 10 gallons is recommended for these fish, but a 20-gallon or larger tank is ideal. Hexagon tanks are suitable since they can provide adequate space, which is vital for Endler’s Livebearers to swim and explore.

Water Parameters – Endler’s Livebearers thrive in water with a temperature of 72-82°F. The pH should be between 6.5-8.5, and they can tolerate a wide range of water hardness. To ensure these parameters remain stable, it is crucial to conduct regular water tests and complete necessary adjustments accordingly.

Some Endler's Livebearers in their tank

Aquascaping – These fish appreciate a well-planted tank with a variety of coverage options. Incorporating plants and rocks.

In conclusion, Endler’s Livebearers are an excellent choice for hexagon tanks due to their striking appearance, peaceful behavior, and adaptability to various water parameters and aquascaping options. Providing them with ample swimming space, stable water conditions, and a well-planned aquascape helps ensure they live healthy and harmonious lives in the aquarium.

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