Molly fish chased by another Molly

Mollies are extremely adaptable and can live in both, fresh and salt water. However, Molly fish has one unusual behavior. It can become aggressive and harm the other mollies.

Let us checkout Mollies depict aggression and how to stop it.

How to Stop Mollies From Chasing each other (Video)

Mollies chasing each other

Mollies are rarely aggressive towards other fish, but they can be little buggers as well. They can become easily stressed out and can cause injury to other mollies by chasing or fighting them.

If there are many mollies in one tank, they can easily get frustrated and they won’t let anyone come in their territory. There are various reasons why Mollyfish behaves this way.

Reasons why Mollyfish fight with each other

If you keep a pair of Molly fish in the same tank, they will soon breed. However, the female Molly will become aggravated when she gives birth. The male Molly will pursue the children and will try to eat them. Thus, it is hazardous to keep your pregnant Molly in a tank alongside the male Molly. Try to separate the pair one the fish becomes pregnant.

Many deaths can be caused during the breeding period. If there are many males and only a few females in the same tank, the males will fight each other to chase a female. After a few days, the females will also start doing the same as they will become tired from all of the attention and getting attacked all the time. Most of the time, they get injured while trying to save themselves or they die after hiding for so long.

Precautions for Mollies

Some quality measures should be taken to prevent the deaths and injuries of Mollies. The owner should take care of certain factors to stop the Mollies from chasing each other in order to prevent untimely and unnecessary deaths in the tank. Therefore, thorough research is always required to find some reliable solutions.

  • Counting your mollies and other fish in the tank is important. Make sure that the equation is one male and two females. The males get frustrated if many females are not around.
  • Always keep a bigger tank. More space will provide mollies some relaxation and they can move easily. Always make sure that your tank has at least 15 gallons per two fish. Also, get a mating tank which is long instead of tall.
  • Always put the female Molly in a separate tank at the time of the labor. Putting it in a different tank would assure its safety and it can give birth to the babies without any fear. A caring fish breeder will keep a 50-gallon tank for the fry to grow up in and will feed them micro-worms and newly hatched brine.
  • Provide theMolly fish with a fair quality food. It is an omnivorous fish which eats all kind of food such as live food, frozen or artificial food. However, they are quite fond of vegetables and algae. They tend to be less aggressive when they are not hungry.


It has been observed that the Black Molly fish will generally be more aggressive than the other kinds of mollies. Be as it may, their aggression level can be diminished by taking important measures and watching them. An aquarium plant in the tank is likewise valuable to ensure different mollies to be pursued. There is a couple of fish that can be kept with mollies, for example, platies, guppies, blood parrot cichlids, gourami fish and blessed messenger angle.

Related questions

Which fish are compatible with Molly fish?

Mollies are quite comfortable with other fish once they bond with them and create a close relationship with them. They are good tank mates with the catfish, Angelfish, Swordtails, platies, Bigger Tetras and Silver tips.

Do Molly fish need a heater?

Similar to other fish, Molly fish tanks require a heater as well. They come in different brands and sizes. The temperature of the tank depends upon the gallons of water. Molly fish strives to perform better in warm water. It is recommended that the temperature of Molly fish should be kept between 75-80° F as it is native to tropical parts of the world.


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