For those who are new to the fishkeeping hobby, it’s important to know how many tetras you should keep per gallon.

While there is no one definitive answer to this question, keeping too many tetras in a small space can lead to overcrowding and health problems for your fish.

In this blog post, we’ll take a closer look at the ideal number of tetras you should keep in your tank and offer some tips on how to create a healthy environment for them.

Rules for Calculating Quantity of Tetra Fish

The number of tetra fish you can keep in your aquarium depends on various factors, and the most important is the size of the tank.

When you grasp tank size, shape, area coverage, and so on, you’ve already done half of the work.

Here are some equations to figure out how many tetra fish you can keep in your tank for every gallon of water.

General Rule of Thumb

Under the “one-inch rule,”  you can allow one inch of fish for every gallon of water. This general rule works for most fish, but not all.

This rule should be used as a starting point when determining stocking levels.

Consider a 10-gallon tank. Neon tetras are tiny, growing approximately 1.5 to 2 inches long.

Let us assume that the aquarium contains a variety of decorations.

So, the 10-gallon tank has a usable volume of 8 gallons.

This means that the “one-inch rule” would allow you to keep 4 to 6 neon tetras in the 10-gallon tank.

Surface Area Rule

This is the mathematical way of determining how many tetra fish are in a tank.

If you have smaller and thinner fish like tetras, you can follow this rule.

According to this rule, each inch of fish needs 1 square foot of surface area.

To do so, you’ll need to know the surface area of your tank. After that, you can calculate the number of fish using the typical rule of thumb.

Can Neon Tetras Survive in A 5 Gallon Tank

Although a 5-gallon isn’t ideal for neon tetras, it doesn’t deny the possibility.

You should give your fish a lot of horizontal space to swim and include rocks and plant life in their tank.

So, keeping more than two neon tetras in a 5-gallon tank is not recommended.

Tips For Keeping Tetras In A 5 Gallon Tank

Keeping your fish in a small tank is a challenging task, and you need to take proper care of your fish.

Here are some tips that might be useful for you.

  • Use a filter rated for 5 gallons or more
  • Make sure the tank is tightly covered to avoid jumpers
  • Pack live plants around the edges of the tank to give tetras cover
  • Do a water change every week, about 25% of the volume
  • Add a dechlorinator to the water to remove any harmful chemicals

Considering Tank Mates

When selecting tank mates for your tetra fish, you must consider their fin sizes.

Fish with long, flowing fins can be easily injured in a small tank.

Also, fish that are large will overcrowd the tank and make it difficult for your tetras to swim.

So, it’s essential to choose the suitable tank mates for your tetras depending on the size of your tank and the fish compatibility with your beloved tetras.

Tetra Fish Tank Mates Combinations for Different Gallons

You may have a school of tetras and other fish in the same tank with various sizes of tanks.

This section will go through the different tank mates that may be kept with tetras in tanks of 5, 10, and 20 gallons.

5-Gallon Tank

As we mentioned, a 5 gallons tank isn’t the best option for tetras.

Tetra fish are active swimmers who require plenty of room to roam; they will quickly become bored if confined.

These fish also need a secure location to hide when they feel overwhelmed.

Because of this, you’ll have a small selection of species to pick from in a 5-gallon tank. Despite this, tetras may be kept in the tank.

Snails are compatible tankmates for tetras in a 5-gallon aquarium.

10-Gallon Tank

You will have more tetra fish species to select from in a 10-gallon tank than in a 5-gallon tank.

Even though a 10-gallon tank is tiny to contain many species, you may be able to mix and match your tetras with others.

You may house six tetras in a school with other two schools of various fish.

You can add neon tetras, ember tetras, cardinal tetras, lemon tetras, and so on to your tank.

Additionally, guppies and ghost shrimps are all compatible with tetras.

20-Gallon tank

The conventional belief about aquarium keeping is that the larger the tank, the better.

You will be able to keep many fish in the tank, but it will also be much easier to maintain.

You may house a variety of tetras, including neon tetras, lemon tetras, red eye tetras, and cardinal tetras, in a 20-gallon tank. You can keep up to 6 to 8 Tetra fish in a group.

Also, you can keep Danios, snails, panda cories, ghost shrimps, guppies, and platys with your tetras school without any problem.

Last Words

Providing your beautiful fish with the space they need is critical to their happiness and health.

We recommend opting for a larger tank if possible so that your fish can swim and play to their heart’s content.

Do you have any questions or comments about keeping tetras?

If so, leave them in the comment section below.