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Number of Endlers vs. Tank Gallon Size (Complete GUIDE)

Being an aquarist, you should first have the ideal tank size sufficient for the movement and schooling of Endlers.

The easily bred and most popular fish for aquariums is the Endler. Luckily, endlers don’t acquire large tanks for a living but need sufficient space.

Below is some interesting discussion on how many endlers can be in a 10-gallon tank.

The number of Endlers in a 10 Gallon Tank

How many Endlers are in a 10-gallon tank? Endlers vary in size from 1 inch (Male endler) to 1.8 inches (female endler). If we talk about the female 1.8-inch Endler, six endlers can live in a 10-gallon tank as highly active fish. I recommend using a 10-gallon tank and keeping one endler per two gallons, i.e., six female endlers and ten male endlers in a ten-gallon tank. Maintaining water parameters in small tanks is a very tough job. For the happy survival of fish, more giant tanks are recommended.

Having 15% fewer endlers in overcrowded tanks is favorable for avoiding conflicts and stress conditions.

Water QuantityMale EndlersFemale Endlers
5 gallons35
10 gallons610
20 gallons1320
25 gallons1625
30 gallons1830
40 gallons2640
Recommender tank size vs. no of male/female endlers

The answer given above is not enough for such a broad topic.

Continue reading about how to make favorable conditions for your endlers, the male-to-female ratio in a single tank, adjusting your tank for multiple endlers, and much more.

Tank size vs. number of endlers

  • The tank size ideally depends on the size of your fish. For example, an adult female Endler is 1.8-inch long. So your Endler, 1.8 inches in length, would need two gallons of water.
  • ten-gallon aquarium can comfortably hold a group of 6 female and ten male endlers.
  • The ideal tank size for endlers is 20 gallons, which can accommodate a reasonable number of about 20 endlers, along with a few more companion fish.
  • My experience indicates that endlers can survive in a minimum of five liters of water if water parameters are optimum.

Tank mates of Endlers

Endlers can live with Guppies, Tetras, Danios, Cory Cat Fish, Tiger Barbs, and Ghourami etc

How many endlers are in a five-gallon tank?

I recommend keeping one male endler per gallons, i.e., a maximum of ten male and 6 female endlers in a five-gallon tank. If you have financial, maintenance and space issues in the home, then use a five-gallon tank, which is easy to buy and maintain and will take up significantly less space in the home.

Important aspects for a happy aquarium

Free space:

Usually, besides the fish, an aquarium is occupied with plants, food, and objects that act as hiding places for the endlers, a water filter, an air pump, and decoration material.

So you must remember how much free space for the endlers would be available in the tank after all this stuff.

Male to Female Ratio in a 5-gallon and 10-gallon tank

Male Endler-oriented 5-Gallon and 10-Gallon tank:

If one of your objectives is to make your aquarium more colorful and you have no interest in endles breeding, you can prefer male endlers in your tank.

The same rule applies; two male endlers in the three-gallon tank and a maximum of seven male endlers in the ten-gallon tank.

Both male and female endler-oriented 10-gallon tanks:

If you want to have both sexes in your tank, you will follow the 1:2 rule. That is one male and two females, i.e., In the ten-gallon tank, keep a maximum of two males with four or three females because males chase the female and harass her when she is alone or one in number.

Single endler in a tank

Endlers are schooling fish. They prefer swimming and living in the form of a group. This way, they feel safer and less stressed.

Naturally, endlers have little emotion about feeling isolated, but it does deteriorate their health compared to the endlers living in a group.

So I advise having Endlers in your tank in a minimum group of five. (for that, of course, you will need a bigger tank like a 20-gallon tank)

Only male endlers living together in the 10-gallon tank

Male endlers have competing nature. They will constantly compete for food which will cause a fight among them.

Male endlers tend to hold territorial disputes as well. Therefore, to avoid an unfortunate environment, you should keep female endles with male endlers in your tank.

Pros and Cons of keeping endlers in a small VS large size Gallon tank

1. Tight space

If you live in a small house or have little space, a five-gallon tank is perfect for carrying with your endler hobby. However, a large-sized tank minimum of ten-gallon for large homes will be preferred.

2. Indoor Aesthetics

Being a colorful fish, endler will improve your home aesthetics, and all this is set in a low space occupied.

3. Low maintenance

The significant edge of keeping endlers in a five-gallon tank is the ease of maintenance of this size. Low maintenance will lead to a pleasant environment for your endlers to dwell in.

4. Aggression

A confined space cause behavioral issues like aggression in the endler fish. Aggression towards its tank mates is a common problem. This unfriendly environment inside the tank can lead to endler death. There are no such issues in large-sized tanks.

5. Waste toxin accumulation

Due to less space, more toxins from endler waste accumulate inside the small-sized tank. These toxins disturb the water chemistry.

6. Poor growth

The growth of endler’s organs is poor due to the confinement of space. They can’t swim freely because poor growth leads to organ failure and premature death.

Keeping endlers in a glass bowl

  • Glass bowls look pleasant aesthetically, but these bowls carry only 2 gallons of water, which is insufficient space for an endler to enjoy a happy environment.
  • If even you buy a filter for your glass bowl, it will be useless because it will not get fixed inside the bowl, and limited features will not allow the filter to work correctly.

Taking Care of the endlers in a 10-gallon tank

A 10-gallon tank is comparatively a large tank. So to keep your endlers alive and happy, you must take good care of the tank/water parameters.

1. Plantation

Make sure you have enough plants in your tank to absorb the carbon dioxide, nitrate, and other substances that are toxic waste from the fish excretion.

In the natural river, endlers survive with just plants and pests. So plantation in the ten-gallon tank is essential.

2. Water Quality Check

Change the water frequently to eliminate all the toxins. If you have a filter, change the water weekly.

If you do not have a water filter, about 40% of the tank water should be changed daily.

3. Feeding Habit

When feeding your endlers, put only a little food as it can pollute the water. Likewise, stop feeding if they stop eating.

4. Water filter installation

You need a filter that will eliminate the ammonia by changing it to nitrite and then nitrite into a less toxic form called nitrate.

Nitrates are removed when you do the water changes in the tank. This process is called the Nitrogen Cycle.

5. PH Level

Also, make sure to maintain a healthy PH level in the tank. Here is how you can naturally control the PH in your water tank.


You can house at most three endlers in a five-gallon tank. The fish will survive but won’t be over the moon.

This is because it needs balanced water surroundings and more swimming space and is a schooling fish.

The ideal tank size is no less than a ten-gallon tank.