I recently bought a platnium betta male who just passed. I had him in a tank with 2 mollies and a female betta, but they all seemed to get along perfectly. I do believe that I should've taken the female out, that was my stupidity. But my grandma got my attention to the betta's eyes. One was brighter than the other. Today, we noticed that his fins seemed to be torn up, but we never saw anybody hurting him because like I said, they all seemed to get along perfectly. The male molly was the only one who was ever around the betta 95% of the time, but I do think the female betta tore up his fins when we weren't paying attention. Any thoughts?

  • 2
    Could you tell a bit more about the size of your tank, water conditions? Commented Jan 25, 2021 at 20:14
  • 4
    Knowing parameters will help, but my initial guess is he was attacked. Bettas (generally) should not have tank mates; they will fight.
    – Gwendolyn
    Commented Jan 25, 2021 at 20:23
  • 2
    The tank is a 10 gallon. I was told by one person that mollies and bettas are fine together, but today another person said you shouldn't put them together. I'm unsure of the water conditions but I do have a filter and the water is a good temperature, as well as being clean Commented Jan 25, 2021 at 23:53
  • 5
    @CatsAreFriends If you have a fish tank you should either have a water test kit or be able to test your water at a local pet shop regularily. Fish excretements release toxic chemicals into the water. There is no way to know how much chemicals are in the water without testing for it. In addition to your Betta being attacked, the number of fish could have been too much for the filter (and beneficial bacteria) and toxic chemicals could have added up. For more information read about the nitrogen cycle
    – Elmy
    Commented Jan 26, 2021 at 7:42
  • I always had a male betta together with (usually) red mollies and other "calm" tropical fish (alongside bottom dwellers like ancistrus), and I never had aggressiveness problems. So it might be that: 1) your fish was sick for some reason 2) the water parameters are sub-optimal.
    – virolino
    Commented Nov 8, 2022 at 9:31

1 Answer 1


Bettas aren't meant to be in the same tank together; males together will fight, though based on my research females together won't. I think the chances of one of them just dying is slim. It's possible that the male attacked the female and you didn't notice, and then the female "got revenge," but that's just a theory.

  • Then how did it raise to the top? :) I did not look at the dates. The problem is that I am not sure how to read the answer to make sense. That is why I do not know how to split it and improve it.
    – virolino
    Commented Nov 8, 2022 at 11:22
  • questions without upvoted/selected answers get bumped periodically
    – Journeyman Geek
    Commented Nov 12, 2022 at 22:15

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.