How Many Clownfish in a Tank? Finding the Right Balance!

If you are planning to breed Clownfish in your aquarium for the first time, there is certainly a lot you need to learn before you start. It is crucial to be aware of the factors when breeding Clownfish and follow the guidelines according to experts and aquarists. Since Clownfish are naturally aggressive, you need to pay attention to their environment and build a suitable nature in the aquarium. The environment of the Clownfish influences the clownfish behavioural pattern and reduces their aggression; hence, a popular question asked by many is how many Clownfish in a tank.

The answer, however, depends on different factors, like the number of Clownfish and the tank size. Hence, to learn more about how many Clownfish in a tank, the article provides an insightful guide about breeding Clownfish in a tank by relating to the different factors.

What is the Minimum Tank Size for Keeping Clownfish?

Clownfish are naturally small fish species; hence there is no problem with putting them in a small or large tank, but different factors influence the answer. Hence, before you figure out the minimum tank size for your Clownfish, consider the number of fish and sizes.

However, according to experienced aquarists, keep your Clownfish at least in a 20 gallons aquarium for a pair because larger spaces allow the fish to swim freely and improve their overall health. Thus, the general guideline, according to experts, is 10 gallons per Clownfish.

How Many Clownfish in a Tank?

As stated, the answer to how many Clownfish in a tank is determined by the number of fish and the size of the tank you choose to put the Clownfish in.

Since Clownfish live in groups under the ocean, the general idea is to put Clownfish in groups to create a calm and peaceful environment in the tank.

Since Clownfish are gender-neutral species and build a hierarchy,  the territorial will get aggressive when mating starts. Because in a school of Clownfish, the largest male and female Clownfish will start dominating by mating.

As a result, putting the rest of the fish at risk as they naturally start bullying the others in the tank. Serious conflicts will take place and sometimes cause the death of a clownfish. Hence, most are concerned about how many Clownfish in a tank.

But a single fish or a pair of Clownfish with a male and female is the healthiest option to avoid conflicts.

Hence, if you are considering putting one Clownfish, a 10 gallons tank will be suitable, and if you want two, put a pair; 20 gallons will be ideal. As stated, the general idea is to increase 10 gallons of water with each Clownfish. 

How Many Clownfish Can I Keep in a Specific Tank Size?

If you are considering one or a couple, 10 to 20 gallons of tank size will be sufficient, but if you want to keep a larger group of Clownfish, the size of the tank increases with each Clownfish. A 10-gallon water tank is usually 20 inches long, 12 inches tall and 10 inches wide.

Since the water quality and the clownfish need to swim freely, the tank size must be large. Thus, as stated, the healthiest way to keep your Clownfish happy and calm is to increase 10 gallons volume; with each Clownfish, for example, 5 or 6 clownfish will need at least 50 to 60 gallons of a volume tank.

What are the Risks of Overcrowding Clownfish in a Tank

What are the Risks of Overcrowding Clownfish in a Tank?

If you fail to follow the general rule and overcrowd the Clownfish in a tank, there are many risks associated with the congested nature. It starts reducing the aquarium’s quality and affects the Clownfish’s overall health. As a result, you are risking a healthy aquarium by overcrowding Clownfish in a tank.

Below are Some Potential Risks, Briefly Explained If you Overcrowd Clownfish in a Tank.

  1. Reduces the Water Quality

An overcrowded clownfish tank will simultaneously lead to reduce the water quality. When large amounts of waste are released through the Clownfish, it changes the colour of the water due to the poor filtration method affecting the fish’s health.


  1. Poor Growth

Since the tank is overcrowded, competition arises when the food is out to the tanks; as a result, some clownfish may need to be fed properly. The lack of nutrition in some clownfish results in poor growth.

  1. Spread of Diseases

The oxygen levels start to lack in the tank when it is crowded because the oxygen receiving is insufficient for the fish in the tank. The lack of oxygen starts weakening the Clownfish’s immune system affecting the overall health of the fish.

If one fish dies because of a disease, it is most likely to spread the disease fast among the other fish because the tank is congested with Clownfish.

  1. Affects the Mental Health

Stress is a common issue faced by any fish in general when the tank is crowded. Hence, a highly populated fish tank will reduce the calmness increasing the aggression because of establishing their territorials. When the overcrowded tank affects their mental health, it also leads to cause issues in their physical health.

Can you have Three Clown Fish in a Tank?

Having three Clownfish in a tank is not recommended because of dominance and hierarchy issues. In a tank of 3 clownfish,  a male and female will naturally pair themselves to mate, establishing dominance.

As a result, the third fish is most likely to be in danger because a couple of Clownfish will start harming the third Clownfish. In difficult aggressive situations, the third fish can also be killed, leaving the male and female Clownfish unharmed.

Thus, having three Clownfish in a tank is not recommended if you want to maintain a peaceful aquarium.

How Many Clownfish should Live Together?

If you need to maintain a calm and peaceful aquarium, having one clown or a couple is better to eliminate hierarchy issues and aggressive behaviour. However, leaving alone one clownfish can make them feel lonely, hence a pair will be more happier.

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Video Credits – Reef Dork

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