Bump on my molly's tail??

matchamochi

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Hi everyone!
My little Molly has a bump beneath her tail, at the start of her tail fin. Can anyone tell me what this may be caused by or how I can help her? I just got two mollies a few days ago and I thought they may be pregnant but am unsure.
(I also popped them in a bag to get a clearer photo, they usually live in an 80L tank.)
Thanks!
 

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Colin_T

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It looks like part of the body is sticking out when it shouldn't be.

You can try deworming the fish and sometimes that can help with livebearers if they have intestinal worms. Other than that, if you just got the fish, return it and get a replacement.
 

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