Betta Tank Size: Everything You Need To Know! (1-100 Gallon Tanks)

Betta fish are popular pets due to their vibrant colors and unique personalities. However, providing a suitable environment for these beautiful creatures is vital for their health and well-being. As we covered in our betta fish care guide, beginners often make mistakes when it comes to suitable tank sizes for their betta so we wanted to publish this article on the topic.

The absolute minimum tank size that we recommend for a betta fish is a 5 gallon rectangle aquarium. We know people often say bettas can be help in smaller tanks but we always recommend against it unless it is a short term situation such as quarantine due to illness.

In addition to tank size, other factors such as filtration, heating, and tank mates (in larger tanks) should also be considered when setting up a betta fish aquarium. By providing the right environment, betta fish can thrive and showcase their stunning colors and captivating behaviors.

An infographic going over a BETTA FISH CARE sheet

Keeping Betta Fish In 1-4 Gallon Tanks

Betta fish in cups
Betta Fish In Cups

Many betta fish enthusiasts may claim that keeping betta fish in tanks ranging from 1 to 4 gallons is acceptable. However, it is essential to recognize that these tank sizes are far too small for betta fish and should be avoided at all costs.

This includes jars, 1 gallon, 2 gallon, 3 gallon, and 4 gallon tanks unless the fish is in quarantine for a short period of time due to a health issue then a 3 or 4 gallon tank can work temporarily.

Betta fish are active swimmers and need sufficient space to move and explore their environment. A tank that is too small can cause undue stress on the betta fish, leading to poor health and reduced lifespans.

A Betta Fish in A Tiny Tank
A Betta Fish in A Tiny Tank

In addition to limited swimming space, small tanks also present challenges in maintaining stable water parameters. This is crucial for the well-being of betta fish. In smaller tanks, it is much more difficult to maintain consistent temperature, pH levels, and adequate filtration.

Another important aspect to consider is the inclusion of hiding spots, foliage, and decorations that betta fish require to feel secure and comfortable in their tank. Smaller tanks make it even harder to provide these essentials without significantly restricting the swimming space.

While a minimum tank size of 5 gallons is generally recommended, larger tanks of 10 gallons or more are even better for the betta fish’s overall health and well-being. As a result, it is highly advised to avoid using 1 to 4-gallon tanks when keeping betta fish.

A Betta Fish In A Vase
A Betta Fish In A Vase

Keeping Betta Fish In A 5 Gallon Tank

A betta in its tank
“Betta splendens” by Joel Carnat is licensed under CC BY 2.0. To view a copy of this license, visit

A 5-gallon tank is considered the minimum tank size for a Betta fish to live comfortably. We would highly recommend a 5 gallon rectangle tank to any of our readers who are looking for their very first betta tank.

This size tank can be an excellent option for beginners, as they are affordable and small enough to fit in most areas of your home. Despite being the minimum size, a single Betta can still thrive in a 5-gallon tank if it is properly maintained and set up.

In order to keep your Betta healthy and content in a 5-gallon tank, it is essential to provide them with a suitable environment. This includes adding plenty of hiding spots, such as live plants, rocks, and decorations, which can give Betta fish a sense of security and safety. Doing so will help reduce stress and encourage their natural behaviors.

The video below goes over a quick, easy, and beginner-friendly 5 gallon betta tank build that you can use for inspiration with your own tank.

Maintaining stable water parameters is another crucial factor in ensuring the well-being of your Betta in a 5-gallon tank. It is important to regularly monitor and adjust the water temperature, pH, and ammonia levels to keep them within the recommended ranges.

A cheap water test kit will usually be able to track all of the important water parameters to ensure everything is within range. Additionally, investing in a reliable and efficient filtration system will go a long way in maintaining a clean and healthy aquatic environment for your Betta.

While a 5-gallon tank is the minimum requirement for Betta fish, it’s worth noting that larger tanks are even more beneficial to their overall health and well-being. Larger tanks promote better water quality, providing a more stable environment and reducing stress on the fish. If it is feasible and practical, upgrading to a larger tank size is always an excellent consideration for the long-term care of a Betta fish.

In conclusion, a 5-gallon tank can provide adequate accommodations for a single Betta fish if it is set up with proper hiding spots, maintained with stable water parameters, and fitted with an effective filtration system. While not the ideal size, this tank setup can still allow your Betta to lead a healthy and thriving life.

Keeping Betta Fish In A 10 Gallon Tank

A betta fish in a 10 gallon tank
A betta fish in a 10 gallon tank

A 10-gallon tank is a great option for betta fish as it provides ample space for them to thrive, while also allowing for creativity in aquascaping. With a 10-gallon tank, there is a wide range of betta tank ideas that you can experiment with, enabling you to create visually appealing betta fish environments.

One of the main advantages of a 10 gallon tank for betta fish is that it is considered the perfect size for a betta breeding tank. Although we don’t recommend breeding bettas to beginners, there are a large number of people out there who have their own dedicated betta breeding tanks and we love 10 gallon rectangles for this.

The larger space not only allows for better water quality management but also contributes to the overall health and well-being of the betta while living in the tank. Some people also keep some shrimp or a snail in a 10 gallon tank with their betta too with this usually not causing problems.

The video above goes over a great 10 gallon betta tank setup that most of our readers should easily be able to recreate for cheap. Betta fish will thrive in a tank like that and should live a long, happy life.

Another benefit of using a 10-gallon tank for betta fish is that it allows for more hiding spots to be added. Bettas appreciate hiding places as they provide a sense of security and aid in reducing stress. By incorporating a variety of plants, ornaments, and other decorations, a diverse and comfortable betta habitat can be easily achieved.

With proper planning and a focus on water quality, temperature, and hiding places, a 10-gallon tank becomes a versatile choice for both beginner and experienced betta fish enthusiasts. Large enough to provide a proper environment for bettas to thrive, yet small enough for convenient placement and creative aquascaping, a 10-gallon tank offers the best of both worlds when it comes to betta fish care.

Keeping Betta Fish In A 15 Gallon Tank

A Betta Fish In A 15 Gallon Tank
A Betta Fish In A 15 Gallon Tank

Betta fish can thrive in a 15-gallon tank, but it is an uncommon recommendation as it falls between the more popular choices of 10 and 20-gallon tanks. Both of these alternative sizes are considered better options for specific betta fish setups.

The 10-gallon tank size is often regarded as perfect for housing a single betta fish. It provides ample space for the fish to swim and explore, while also allowing for easier maintenance and monitoring. In addition, it offers sufficient room for the betta’s bioload and the addition of a few plants and decorations, which will help create a stimulating environment for the fish.

On the other hand, a 20-gallon tank is typically considered the minimum size for keeping two female bettas together in a single tank. This larger tank size offers enough room to accommodate the additional space requirements and territorial needs of multiple female bettas while reducing the risk of aggressive behavior among them.

While a 15-gallon tank can work for bettas, it may not always be the best choice based on individual needs. If a hobbyist is planning to keep a single betta, a 10-gallon tank might be a more practical and suitable option.

If the goal is to establish a small betta community tank, then a 20-gallon tank or larger would be the more appropriate choice. Nonetheless, a 15-gallon tank can still be a viable option for those who wish to provide their betta fish with a bit more room than a 10-gallon tank without venturing into the larger commitment of a 20-gallon setup.

Keeping Betta Fish In A 20 Gallon Tank

A betta in a 20 gallon tank
A Betta In A 20 Gallon Tank

A 20-gallon tank is an excellent choice for betta fish enthusiasts who want to create a more dynamic aquatic environment. This larger tank size allows you to keep two female betta fish in the same tank, which can be an advanced and rewarding project if done correctly.

However, it is important to consider the naturally aggressive nature of betta fish. To successfully maintain multiple bettas in a 20-gallon setup, it’s crucial to carefully plan and design the tank layout. Providing enough hiding spots and visual barriers can help alleviate stress and minimize territorial disputes, especially among female bettas.

Although experienced betta keepers can do it, we would never recommend keeping more than two bettas in a 20 gallon tank if you are a beginner. This minimizes the chances of aggressive encounters and reduces the risk of one betta dominating the tank. Additionally, male bettas should not be housed together due to their heightened aggression levels.

To create an optimal environment in a 20-gallon tank, consider the following suggestions:

  • Hiding Spots: Adding live plants, caves, and decorations can provide sufficient hiding spaces for bettas to retreat and de-stress. These additions not only offer visual appeal but can also reduce aggression by breaking up the line of sight between fish.
  • Water quality: Maintaining excellent water quality is crucial for the health of your bettas. Ensure the tank is properly cycled and equipped with a suitable filtration system for efficient removal of ammonia, nitrites, and nitrates.
  • Tank Mates: When introducing other fish species into the tank, choose peaceful and compatible tank mates that can tolerate the presence of bettas. Avoid any fish with long fins or bright colors, as these may trigger aggression in bettas.

By taking these factors into account, a carefully planned and well-maintained 20-gallon tank can provide a healthy, enriching, and vibrant environment for betta fish.

Keeping Betta Fish In A 30 Gallon Tank

A 30 gallon tank
A 30 Gallon Tank

A 30-gallon tank offers an attractive and spacious environment for betta fish that can definitely enhance the well-being of the fish. This tank size provides ample room for your betta to swim and explore, while also allowing you to create an interesting and diverse aquascape with many hiding spots.

One of the benefits of a 30-gallon tank is that it allows more opportunities for your betta fish to coexist with other tank mates harmoniously. Consider adding schooling or bottom-dwelling fish that are compatible and won’t provoke aggression from your betta. Suitable tank mates include neon tetras, corydoras catfish, and harlequin rasboras. But remember, always research carefully before introducing new species.

In order to create a comfortable and stress-free environment for your betta, it’s essential to incorporate sight breaks and hiding spots. These can be achieved through the use of plants, stones, driftwood, and other tank decorations. By doing so, you will reduce the chances of territorial disputes and provide your fish with their own, designated personal space.

A Video Going Over How To Setup A Great 30 Gallon Tank

Enriching your 30-gallon tank with a variety of aquatic plants not only contributes to the aesthetic appeal, but also supports the well-being of your betta fish. Plants like java moss, java fern, and anubias can help in maintaining suitable water parameters, as they help to absorb nitrates and other harmful substances from the water.

In summary, having a betta fish in a 30-gallon tank can lead to a thriving aquatic ecosystem with various tank mates and beautiful, natural elements. Ensure compatibility among the inhabitants and provide a well-decorated and maintained environment to ensure the happiness and longevity of your betta fish.

Keeping Betta Fish In A 40 Gallon Tank

a 40 gallion aquarium
A 40 Gallion Aquarium

A 40 gallon tank can work well for a variety of betta fish setups but there are usually better options out there for most people.

The 40 gallon tank sits between the 30 gallon tank, which is ideal for keeping betta fish with other species, and the 55 gallon tank, typically the minimum recommended size for a large-scale betta sorority tank leaving the 40 gallon tank in an awkward spot.

That said, there are a number of situations where the size of a 40 gallon tank might be the perfect option due to the space you have available. In this type of setup, you can usually create a small betta sorority or community tank.

When setting up a 40 gallon betta tank, factors such as water temperature, filtration, and hiding spots are essential. Bettas prefer temperatures between 78 – 80°F necessitating the use of a heater in most areas.

A proper filtration system is crucial, as it contributes to the water quality and helps prevent the buildup of harmful wastes. Additionally, it is vital to provide adequate hiding spots, such as caves or plants, allowing fish to feel secure and reduce their stress levels.

Keeping Betta Fish In A 55 Gallon Tank

Betta fish in their tank
“Betta smaragdina pair1” by –Acapella 09:31, 31 December 2006 (UTC) is licensed under CC BY-SA 3.0. To view a copy of this license, visit

Experienced betta fish keepers may consider keeping their Bettas in a 55-gallon tank, as it opens up new possibilities and setups. A large tank like this is perfect for creating a betta sorority or a betta harem with some people using these tanks for huge community tanks.

These types of large-scale tanks can be challenging, especially for beginners, but with proper knowledge, they can be a rewarding project to undertake.

55 gallon tanks allow you to keep a white range of plants, decorations, driftwood, and rocks to provide plenty of cover and hiding spots. This is key when keeping bettas with other fish be it other bettas or different species but with a tank like this, you have all the space you need.

A Video Going Over A 55 Gallon Tank Build.

Despite these benefits, it’s essential to use caution when keeping bettas in larger tanks. Always monitor their behavior to ensure they are adjusting well to the size and the presence of other fish.

Keeping Betta Fish In Tanks Over 70 Gallons

Betta fish in a large community tank
“File:Female bettas in community tank.jpg” by No machine-readable author provided. Epastore assumed (based on copyright claims). is licensed under CC BY-SA 3.0. To view a copy of this license, visit

Tanks over 70 gallons cater to experienced fish keepers. Ss they come with a higher price, larger size requirement, and usually need advanced skill levels to maintain, these larger tanks allow for elaborate betta fish setups, including more extensive sororities and community tanks.

In spacious tanks of this nature, betta sororities – groups of female bettas – can coexist with minimal aggression. These tanks offer ample space to incorporate hiding spots and various aquatic plants, reducing stress among the inhabitants and resulting in healthier, happier betta fish.

Adding different species of non-aggressive fish in community tanks with bettas becomes a possibility, thanks to the vast size of the tank. Some suitable companions for bettas are tiger barbs, gouramis, and giant danios.

A Huge 300 Gallon Betta Sorority Tank

Caring for tanks over 70 gallons requires proficiency in water chemistry and filtration. These large tanks demand substantial upkeep to ensure the aquarium environment remains stable and ideal for betta fish. Ensuring proper temperature regulation, maintaining the nitrogen cycle, and implementing appropriate filtration systems becomes critical.

In conclusion, tanks over 70 gallons provide potential for remarkable betta fish experiences, with expansive community tanks and sororities. However, the increased size and complexity of these environments demand advanced skills and commitment from the fish keeper.

Similar Posts