This has never happened before. My fish are in a 20 gallon (76 liters) tank, they've been fed the exact amount every day, and none of them have had problems before (other than another incident with my - now moved - pearl gourami). This came relatively out of nowhere and I'm decently new to owning fish. Should I buy another tank? What can I do to keep the molly from acting out?

  • Add more information, like how many fishes are in the tank, if you have plants or other refuges and with this i can help u :D
    – Gawey
    Commented Apr 15, 2019 at 6:46
  • 1
    Welcome to Pets :) Have you tested your water quality recently? If so, what are the readings for ammonia, nitrite and nitrate.
    – Henders
    Commented Apr 15, 2019 at 17:32

2 Answers 2


Look for a fish breeding box as a temporary solution. You can get a small plastic container with holes in that will sit in the tank and give one fish his own private space without requiring a second tank set up. Personally, I'd isolate the trouble maker and give the injured one time and comfort to relax and establish territory (if they do that).

I used to use a cheap breeding box to give my fertile female goldfish a break. I wasn't breeding them, but they used to get pushed around a lot when they were fertile, for about a day every two weeks for a few months in summer.


Separate them immediately! If a fish is losing pigment then it is getting damaged terribly. My grandparents are big fish people, they also said this is bad. The fish may require more food, so first move it to a different tank, but feed it more as a last resort.


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