What size tank is good for a betta fish?

In this post, we will discuss the topic “What size tank is good for a betta fish?” and the steps of setting up a betta fish aquarium.

What size tank is good for a betta fish?

The good tank size for your betta fish is at least three gallons. Choosing the right size tank for your first Betta splendens aquarium might be difficult because of the contradicting information available. As far as Betta fish tanks go, everyone has their idea of how they should appear.

Betta fish tank capacity

Despite what many sites say, Bettas cannot be maintained in a bowl or vase. Keep the Betta in a suitable tank, or else it will die rapidly.  As with any other fish, you’ll need an aquarium to house your Betta.

Based on the foregoing, we suggest that Betta fish be kept in aquariums that are at least 5 gallons in size (19 liters). Bettas will have plenty of room to roam about in these tanks, which are normally at least 12″/30 cm wide. Tanks that are wider than they are tall are better for Bettas, who must be able to sprint to the surface to obtain breaths of air. Betta aquariums, like other aquariums, need to be filtered, heated, and cycled regularly.

The problems with Betta Bowls 

Betta bowls, vases, and other small setups are a no-go for us. There are drawbacks to a tiny water volume. So, What’s wrong with containers less than 2.5 gallons, like Betta bowls?

There isn’t enough space for equipment. When it comes to Betta bowls and tanks, most are so little that there’s no space for the necessary equipment to keep your Betta happy and healthy. Even if you can put a filter into the bowls, it will be unable to bioload generated by your betta fish due to the limited amount of water.

Tanks that don’t have a lot of movement are more susceptible to water quality changes.

Despite this, It is hard to say when dangerous levels of ammonia, nitrite, or nitrate may build up. Bettas may benefit from daily 100% water changes, but the stress of adapting to different water values every day might lead to sickness or even death.

There is not enough space to swim.

Small fish, like the Betta, require space to swim, as previously indicated. One of the most prevalent reasons for mortality in decorative Bettas may be obesity-related, such as the development of fatty liver disease, which some aquarists believe to be the most common cause of death in this species.

Tiny bowls are not good for betta fish.

Beginner betta fish keepers often choose a 1- or 2-gallon bowl or vase as their betta fish aquarium. Many people believe that bettas can live in small spaces because they can breathe surface air and survive in a hoof print left in a rice paddy’.

Keeping them in such cramped quarters, they are unlikely to survive beyond the age of two.

Your Betta may survive for 5, 6, or even more years in a big aquarium with adequate care.

How to pick the right Betta fish tank

A betta-friendly aquarium may be easily set up with a little foresight and understanding. The most critical aspect of betta fish care is choosing the proper tank size, although several other factors, such as substrate and filtration, must also be considered.

What minimum tank size does my betta fish need?

Many experts believe this to be the lowest size that is appropriate. The ideal size for a typical fish keeper is the tiniest, they believe that the minimum tank size is 1 gallon. However, this is the very minimum that may be tolerated. As the capacity of a 1-gallon tank is so little, it is practically impossible to keep the temperature stable for the sake of bettas.

As the ambient temperature rises and falls, so does the amount of water in a tiny tank. This is bad for the fish since it causes the water to increase and fall much more rapidly than in a bigger tank.

It’s advisable to think about the minimum size than the suggested tank size. Because, in reality, the more space you have, the better off you will be. If you want to keep your betta happy in the smallest tank possible, then a 5-gallon tank is the bare minimum.

Toxic elements like ammonia and nitrates will be less concentrated in a 5-gallon tank compared to a 1-gallon tank, which means that your betta’s health will be less affected.

Another benefit of a greater capacity is its ability to maintain a stable temperature and not vary as much with changes in air temperature. In addition, this implies that you have a far broader range of heaters to choose from. It is critical for any fish’s health to maintain a consistent temperature, as previously indicated

Finally, having a bigger tank opens up a wider range of design possibilities, such as the addition of ornaments, live or fake plants, and more. Your fish will thrive in this improved habitat, and you’ll enjoy the improved aesthetics.

What are the reasons larger tanks are to smaller ones?

Larger tanks are superior to smaller ones appears counterintuitive. You may assume that they will need more time and effort to maintain. However, the more space you have in your tank, the less labor you’ll have to put in.

Here are some of the advantages of larger tanks:

The Stability of Large Aquariums

Smaller aquariums are more prone to a buildup of bioload, which may occur more quickly than in bigger tanks. There will be a massive ammonia buildup when the bioload is too high.

Bettas are poisoned by ammonia, therefore if the levels in your tank remain high for an extended period, you risk losing your fish.

It is easier to dilute ammonia and other chemicals in tanks with a lot of water. You’ll have to wait longer before your tank reaches a harmful level of buildup. In addition, you won’t have to do water changes as often or as intensely as before. A smaller tank needs weekly water changes, but a bigger tank may get away with less frequent water changes.

Hold More Fish

One further drawback of keeping fish in smaller tanks is that they are unable to accommodate the same number of fish as bigger ones. As an example, it just takes a few fish to overcrowd a 10-gallon aquarium without your ever noticing.

A larger tank, on the other hand, will eliminate this issue. As the size of your tank increases, the number of fish you may safely keep increases. Even if you initially plan on keeping just your betta, you never know whether your preferences may change.

Another drawback of smaller tanks is that the temperature fluctuates more often.

An external temperature change will have a greater impact on a smaller tank compared to a bigger tank. Even a 5-gallon tank’s temperature may decrease rapidly if the ambient temperature drops suddenly. To the extent that your windows are open.

A larger tank, on the other hand, will take a longer time to raise and decrease in temperature.

If you have a larger tank, your betta won’t notice the fluctuations as much.

The aggressiveness of your Betta will be reduced.

There is less likelihood that your betta will be hostile towards other fish if the tank is large enough. Because they’ll have more land to call their own, they’ll feel more at home there.

You’ll be able to maintain another semi-aggressive fish in addition to your betta because of this.

Can a Betta live in a tank that is too large for it?

Larger tanks give him greater freedom to go around and discover new things. However, the contents of the tank, not their volume, are what matter most.

Bettas are used in thickly wooded environments and a variety of hiding spots in the wild.

In other words, if your aquarium is spacious but devoid of any plants or decorations, your betta will be unhappy. If you have a big tank, make sure that your betta has plenty of places to hide. Add a lot of plants to make it seem like a true home.

They include Anacharis, Hornwort, Anubias, Java Moss, and Java Fern, which are all excellent options.

Avoid choosing a tank that is excessively deep if you want to keep a lot of fish. For Bettas to breathe, they must rise to the surface of their tank. This is because they have a labyrinth organ. Too deep a tank will have difficulty rising to the surface. However unlikely it may be that your betta would die as a result, it might give him a great deal of worry.

If you maintain it beautifully decorated, your betta tank will never be too large. All kinds of large-leafed plants and driftwood are excellent options. When it comes to hiding places for your betta, you may also use rocks and cave-like formations like this one:


In this post, we discussed “What size tank is good for a betta fish?” and the steps of setting up a Betta fish aquarium.

If you have any thoughts or doubts, feel free to drop us a comment below!

Frequently Asked Questions (FAQs): What size tank is good for a betta fish?

Do betta fish prefer aquariums that are large or small?

Bettas prefer bigger tanks with more open water swimming rooms rather than little vases and bowls, which is what most people imagine.

A one-gallon tank isn’t big enough to house what?

You cannot keep betta fish in a 1-gallon tank, even if you want to upgrade in the future; too many enthusiasts acquire species that need bigger aquariums intending to upgrade in a few months.

Is a 20-gallon tank too large for a Betta fish?

A 20-gallon fish tank is a good choice if you want to add some tank mates to your betta.

With a tank of this size, you’ll be able to keep fish like tetras and mollies, which may grow larger than bettas, in your aquarium.

When it comes to bettas, how much space do they require?

A very little fish can survive if there is a filter and enough supply of air in the water.

A bowl is out of the question. To breathe, bettas can take in air from the water’s surface via a “lung-like organ.” However, a betta may live in a half-gallon bowl, but it is harsh and painful.