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?

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    Could you tell a bit more about the size of your tank, water conditions? Jan 25 at 20:14
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    Knowing parameters will help, but my initial guess is he was attacked. Bettas (generally) should not have tank mates; they will fight.
    – Gwendolyn
    Jan 25 at 20:23
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    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 Jan 25 at 23:53
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    @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
    Jan 26 at 7:42

betas aren't meant to be in the same tank together like male and male will fight but females together don't I did research and found out they can be together the chances of one of them dieing is slim it is possible when you were not paying attention the male could of attacked the female and the female could of got (revenge) or nibbled him back but that is my theory

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