Best 2.5 Gallon Tank For Betta Fish | Aquascape Addiction

Best 2.5 Gallon Tank For Betta Fish

As an Amazon Associate I earn from qualifying purchases.

We cover and review what we feel are some of the best 2.5 gallon tanks for betta fish, we have carefully selected 3 picks and covered them in detail to help you decide.

Best 2.5 Gallon Tank For Betta Fish

When it comes to aquarium fish, the Betta fish is undoubtedly one of the coolest options out there by far. They look really nice, they have a heck of an attitude, and you can even teach them tricks. Opposed to common belief, these guys can’t just be put in a fish bowl.

They need to be put in a real tank with filtration and all of that fancy stuff. Let’s take a look at some options in terms of the best 2.5 gallon tank for Betta fish right now (this is our top pick).

Aqueon LED BettaBow Our Top Pick 9.5/10
Koller AquaView Good Starter Kit 9.3/10
All Glass Aquarium Tank Glass 2.5 G Tank 8.8/10

Is 2.5 Gallons Big Enough?

Ok, so the first thing we have to figure out is what the right size of tank for a Betta fish is. Now, goldfish bowls are definitely out of the question, as we mentioned before. Most sources will tell you that a 2 gallon tank is enough for a Betta fish.

While that is technically true, it is the bare minimum amount of space that your Betta needs. Although it is technically big enough, it’s not quite ideal. Moving to the 2.5 gallon tank, it is a better option no doubt. It will give your Betta fish a little more space to maneuver, to play, and to live.

However, a 2.5 gallon tank is really only good if you only have a single Betta fish and not all that many decorations. If you feel like having a Betta fish, plus some community members, and some nice decorations too, you might want to go for a 4 gallon tank. With that being said, for beginners who just want a Betta fish with a couple of decorations, a 2.5 gallon tank should suffice.

Best 2.5 Gallon Tank For Betta Fish: Reviews

Here we have 3 options to go with, each of which are good 2.5 gallon Betta fish tanks. Some of them are a little simpler than others, while some come with everything you need to get started. Let’s take a closer look at each of these 3 options right now.

1. Aqueon BettaBow Aquarium Kit

This first option is one of our personal favorite 2.5 gallon Betta tanks to go with. It’s a good all in one option that comes with more or less everything you need. First off, this is an acrylic tank, which is just fine because acrylic is tough, it’s lightweight, and it does not distort the image when viewing from the outside either.

It’s a nifty little tank that can fit pretty much anywhere you would like to put it. It has 4 clear sides, which provides you with a good 360 degree viewing experience of the interior.

The Aqueon BettaBow Aquarium Kit comes with a filtration unit included. It’s nothing huge, but it engages in all major types of filtration to keep the water clean. Now, the filter is not the best in the world as it won’t handle messy fish too well, but Betta fish are not very messy, so this is not going to be an issue here.

The filter itself might start off a little loud due to vibrations, but it’s actually not all that loud either. On a side note, we do like the bit of elegance added to this tank thanks to the nice black base that is included.

The Aqueon BettaBow Aquarium Kit comes with a nice black hood that keeps everything where it is supposed to be. At the same time, the hood contains bright LED lights to keep the whole tank illuminated whenever you see fit.

Although this is a small 2.5 gallon aquarium, which is really only ideal for a single Betta fish, it does actually come with a divider so you could keep 2 Bettas in the tank. However, to be quite honest, if you keep 2 Betta fish in this tank, there just won’t be enough space. The Aqueon BettaBow Aquarium Kit also comes with water care samples so you can treat the water, plus it comes with some small samples of fish food as well.


  • Fairly durable tank.
  • Good all in one option.
  • Comes with everything you need (more or less).
  • Ideal size for small spaces.
  • Decent filtration unit for Betta fish.
  • Fairly strong lighting unit.


  • Filter can vibrate and create noise.
  • Does not include substrate or plants.
  • Filter is not powerful enough for anything but Betta fish.

Click here to check the price at Amazon

2. All Glass Aquarium Tank

This is the exact opposite of the first option that we just looked at. With the All Glass Aquarium Tank, all you get is the tank itself. We do like the size of it because it will provide your Betta fish with more than enough space to swim, even if you have a bunch of plants and other decorations.

Now, some people don’t like real glass as it is quite heavy, but we think it just looks better than acrylic. In our opinion, real glass is always the way to go.

The glass has been tempered and specially treated so that it does not bow, scratch, and so that it can withstand pretty much anything you throw at it. The seams have been factory sealed in order to ensure that no leaking occurs.


  • Very durable.
  • Real glass.
  • Will not leak.
  • Plenty of interior space.


  • Only the tank is included.
  • Takes up a fair amount of space.

Click here to check the price at Amazon

3. Koller AquaView

The Koller AquaView is the final option on our list today, but also another really good one. Like the first Betta tank we looked at, this one comes with more or less everything you need to get started. First off, the Koller AquaView is made with really clear plastic.

The plastic here is fairly durable as it is made to be impact resitant, it’s hard to scratch, it won’t leak, and it provides a really clear view of the inside as well. While it may not be quite as nice as real glass, it certainly gets the job done.

We do like that the Koller AquaView comes with a hood with a built in lighting system. For one, the hood keeps everything exactly where it is supposed to be. Also, the LED lighting system is very energy efficient, it can be programmed to turn on and off whenever you see fit, and it comes with 7 different colored bulbs, all of which provide some really nice dazzling colors for the interior of the aquarium.

The timer here is really easy to use, so there should be no problem there. The Koller AquaView can be powered with batteries, with a USB outlet, or by plugging it into an outlet.

This tank also comes with a fairly powerful internal filter. Now, while it may be a little noisy, it certainly does get the job done. It uses a simply filter cartridge that acts as an efficient 3 stage filter. It will remove solid debris, ammonia, nitrates, odors, colors, and other pollutants from the water as well.

This filter has a flow rate of 25 gallons per hour, so it is actually quite powerful and should do a fine job at keeping the tank water clean. The Koller AquaView is very easy to set up and to maintain, which is quite the bonus if you ask us.


  • Really nice look.
  • Durable plastic design.
  • Very clear.
  • Good hood.
  • Efficient and colorful lighting system.
  • Efficient filtration unit.
  • Does not take up too much space.


  • Filter can be a little loud.
  • Filter requires replacement cartridges fairly often.
  • LED lights do not last all that long.

Click here to check the price at Amazon

What Else Do I Need To Get Started?

There are a couple of other things that you will need to get your Betta tank setup and ready for your fish. These things are nothing major, but you will definitely want to include them none the less.


One of the most important things you will need for your Betta fish tank is the substrate, or in other words, the layer of material at the bottom of the tank. For Betta fish, a fine aquarium gravel will do just fine (we have covered our favorite 10 substrate picks here).

You should probably stay away from sand because your Betta tank won’t have too many rooted plants to deal with. Also, sand makes aquariums fairly hard to clean. Also, don’t go with a coarse aquarium gravel option, as Betta fish might hurt themselves on it. Fine and smooth gravel is the best way to go.

Plants & Decorations

Betta fish live in places where there are lots of plants, rocks, and little pieces of wood floating around. So, you want to do your best to replicate this environment. Betta fish like to have a lot of plant life around (more on the ideal plants for Betta's over this article), as it helps them relax, feel at home, and it gives them some places to hide as well.

They like to hide sometimes. For this reason, you should also include some driftwood and rock caves, things that they can swim under, into, and behind. It’s all about replicating the natural environment they come from (you could even get some toys too).

Lighting & Filtration

Another thing you will need to get for your Betta tank is a basic filtration unit. Many people say that Betta fish do just fine in fairly dirty water, which might be true, but it is not ideal. Betta fish will be much happier and healthier if you keep the water clean and crystal clear.

A simple filter with mechanical, biological, and chemical filtration will do just fine. It does not have to be anything overly huge or expensive. On that same note, while Betta fish don’t actually require lighting, it is also a good thing to keep in mind. A good light for the daytime will brighten things up, keep your Betta fish happy, and it will help the plants in the tank grow better as well.

Commonly Asked Questions

How Big Is A 2.5 Gallon Tank?

A 2.5 gallon fish tank is indeed very small, about as small as it gets. Sure, there are 1 gallon tanks out there, but they should not really ever be used.

A 2.5 gallon tank, in terms of dimensions, comes in at 12 x 6 x 8 inches. Sure, there may be other dimensions which these can come in, but this is the normal size.

How Often Should I Clean A 2 Gallon Betta Tank?

A 2 gallon betta tank should be cleaned at least every week. Keep in mind that small fish tanks need to be cleaned much more often than larger tanks.

The reason for this is because debris, fish waste, and other pollutants build up really fast in smaller tanks, so the smaller the tank, the more it needs to be cleaned. You should aim to clean your 2 gallon betta tank once per week, and also remember to perform regular water changes as well.

That being said, a 2 gallon tank is quite small, and while it may meet the minimum tank size requirements for betta fish, it’s not an ideal size. Your betta tank should be larger than 2 gallons.

Does My 2.5 Gallon Betta Tank Need A Filter?

Many people will tell you that a small betta fish tank with 1 betta fish does not really require a filter because in the wild betta fish live in pretty murky and muddy waters.

While they do live in pretty murky waters, as they often live in rice paddies, the statement that these fish do not require aquarium filters is indeed nothing more than a falsehood and a misconception.

Sure, they may be able to survive for a while without a filter, but will always be better off with than without one. The cleaner the water is, the happier the betta will be, and the longer it will live for. We have reviewed our favorite filters here.

What Are Other Good Fish For 2.5 Gallon Tanks?

Keep in mind that the rule of thumb is that you should have 1 gallon of water for every inch of fish at the very least. This therefore means that there are really no good fish to house in such a small 2.5 gallon fish tank.

Sure, you can cram a betta fish, a guppy, or a neon tetra into such a small tank, but it is really not ideal. It’s just a way too small tank for virtually any and all fish keeping purposes.

So it’s quite hard recommending the best fish for 2.5 gallon tanks as space is limited, it is a good idea to perhaps look at a larger tank size of 5-10 gallons+.

Is a 2 Gallon Betta Tank Really A Short Term Solution Only?

Yes, indeed it is. The ideal tank size for a betta fish is somewhere around 5 gallons. Sure a 2 gallon tank may technically meet the minimum requirements, but it’s definitely not ideal.

Therefore, we would consider a 2 gallon betta tank to be nothing more than a short term solution, if even that.


So a good 2.5 gallon tank with a few plants, a couple of rocks, and maybe a piece of driftwood, should be more than fine for your Betta fish. We would recommend going with any of the above tank options (The Aqueon BettaBow is our top pick), especially for beginners who want something small.

Don’t forget to keep your Betta tank nice and clean, and don’t forget to feed your fish the proper food either. Betta fish really are quite easy to take care of.