Why are my GloFish fighting? What causes aggression and how to stop it?

Question

My GloFish are fighting each other. To be exact, one is fighting the other ones. My yellow one started going solo a day before the fighting. No one can give me a straight answer to why!!! Pet's info: Fish | Unknown - Fish | Male | 3 months and 13 days old | 0.1 lbs

Angel Alvarado, LVT · Accepted Answer

GloFish are schooling fish. They do best in groups of 6 or more. If you have just a few, they may be stressed which can cause aggression. Check the water parameters since an imbalance in chemistry can cause stress as well. You can use a home test kit (one with liquid drops, not test strips) or submit a sample to you local pet store or aquarist. Most will perform water testing for free or for a nominal fee. Ideal parameters measure 0 ppm (parts per million) ammonia and nitrites with nitrates at 40ppm or less. pH of the water should be between 6 and 8. They are cool water fish, so aim for a water temp between 65 F and 75 F. Hopefully, this will help. The other option you have is to remove the aggressor. You can request a consultation to discuss the situation and set up in greater detail or if you have further questions or concerns.

Why are my GloFish fighting? What causes aggression and how to stop it?

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