It can be pretty difficult to judge how many fish can fit in a certain size of aquarium. After all, each type of fish usually has different spatial requirements. This is only made harder when you want to setup a community tank with various fish species within it. For instance, if you want to get a 10 gallon tank, and you want to have Neon Tetra fish, you will need to know how many of them can fit.

After all, these little guys are schooling fish, so you cannot keep them along, but if you have a limited 10 gallon tank, you also cannot cram too many of them into that small space. So, how many Neon Tetras in a 10 gallon tank can you fit? This question, plus a couple to do with tank mates and community members are ones that we are going to answer right now.

If you need some 10 gallon tank suggestions we covered our top 10 picks here.

## Neon Tetra – Size & 10 Gallon Tanks Housing

Ok, so the first thing that you should probably know is how big a Neon Tetra fish gets. Well, generally speaking, they can grow anywhere from 1.5 to 2 inches in length, with 2 inches being quite rare.

### Calculating It

When it comes to calculating how many fish can fit in a certain area, you are better off going with a liberal estimate in terms of fish size, rather than conservative, or else you will end up with a tank that is too small. Seeing as Neon Tetras usually do not grow larger than 1.6 inches, to be on the safe side, we will go with a measurement of 1.75 inches.

The general rule of thumb with any fish under 3 inches in length, is that they require about 1 gallon of water for each inch of fish there is. Therefore, a 1.75 inch long neon tetra would need roughly 1.75 gallons of water. Easy enough right? So, when a 10 gallon tank is in question, you could safely fit around 6 Neon Tetras without issue. 10/1.75 = 5.7, but we can round that up to 6.

### Play It Safe

Seeing as we were liberal with our Neon Tetra size estimate, you might even be able to fit 7 of them, but this might be pushing it. Remember, you can fit 7 Neon Tetras in a 10 gallon tank if they are each 1.5 inches long, but chances are that they will probably be around 1.6 or 1.7 inches long each, so to be safe, we would go with 6 of them per 10 gallons.

You might also like our post on Neon Tetra Disease and Prevention, you can find it here.

## How Many Neon Tetras In A 10 Gallon Tank With Betta Fish?

Now, Neon Tetras are very peaceful schooling fish. They are fairly calm and docile, and they have a light temperament too. They make for really good tank mates. Lots of people of course want to have more than 1 type of fish in a tank.

One really popular fish is the Betta fish. Yes, Betta fish do have a tendency to be a bit aggressive and territorial, but this does depend on the amount of space they have and the other types of fish they are with. No, you cannot usually have more than 1 Betta fish in the same tank, but Neon Tetra fish and Betta fish tend to get along with each other, granted that you afford them enough space.

A Betta fish should have at least 3 gallons of water to be happy and comfortable. This is actually the minimum recommended tank size for a Betta though **we would personally recommend at least 5-10 gallons+**.

At any rate, if you have your Betta fish swimming in the same tank as other fish, you will want to provide extra space to avoid any bullying, disputes, and fights between the Betta and the Neon Tetras. Keep in mind we are talking about a 10 gallon tank here.

So, let’s give your Betta fish 5 gallons+ of space to be safe, so there are no fights. This then leaves 5 gallons for your Neon Tetras, which is admittedly not much. Going back to our calculation before, 5/1.75 = 2.8, or in other words, those other 5 gallons can fit roughly 3 Neon Tetra fish.

Therefore, a 10 gallon tank could potentially house 1 Betta fish along with 3 Neon Tetra fish. We were quite liberal here, so you could probably fit 1 Betta with 4 Neon Tetra fish in a 10 gallon tank, but you will have to provide lots of plants and caves for hiding and stress relief, which will help to avoid confrontations.

If you need some food suggestions then we have covered our top picks here.

## How Many Neon Tetras And Guppies In A 10 Gallon Tank?

Another nice looking, peaceful, and mild tempered tank mate to go with for Neon Tetra fish is the Guppy. Guppies are actually a little larger than Neon Tetras. Guppies do actually differ in size based on their gender.

Males can grow to 1.4 inches long (1 inch is the average), while females are known to get up to 2.4 inches long (2 inches is the average). Once again, when calculating how many fish can fit in a certain number of gallons, it is best to be liberal when choosing the size of fish to calculate with.

Therefore, to be safe here, assuming that you want male and female Guppies, we will use a straight 2 inch measurement for Guppies. Going back to our rule before, fish under 3 inches long usually need 1 gallon of water for every inch of fish. Therefore, in a 10 gallon tank, you could comfortably fit 5 Guppies.

However, we are here to find out how many Guppies and Neon Tetras can fit in a 10 gallon tank, you will need to calculate this. Let’s assume that 4 of the 10 gallons are for Guppies, so you can gave 2 Guppies, which means there are 6 gallons left over for the neon Tetras. 6/1.75 = 3.4 (gallons divided by Neon Tetra size).

Therefore, in a 10 gallon tank, you could have 2 Guppies and 3 Neon Tetras (4 Neon Tetras if you want to push it). Or, you could have 3 Guppies (which will take up 6 gallons), and in the 4 remaining gallons, you could have 2 or maybe 3 Neon Tetras.

Also don't forget to get a good and reliable filter for your 10 gallon tank, we have covered our top 5 here.

## A General Note

If you do have the budget available it is **always better to get a bigger tank** than 10 Gallons if money and space allows, it’s generally always good to give the fish extra space and this also allows for more decorations/plants (remember plants and decorations take up water space too).

## Conclusion

As you can see, calculating the number of fish that can fit in a certain size tank is not hard. However, it does get a little more difficult when you want to have different types of fish in the same tank. At any rate, Neon Tetras are peaceful and they can be easily house with a couple some Guppies or Betta fish, just make sure to give them more than enough space, especially where Bettas are concerned.