Hello everyone :] So lately I have noticed that my halfmoon's caudal fin has been getting torn up. At first I thought he was tail nipping so I was keeping a close eye on him but that doesn't seem to be the case. Then I was wondering if he was getting caught up in the plants I have in there. I only have a red ludwigia and I think the leaves are far to soft to be causing damage. Or am I wrong on that? Tonight, I just noticed damage to his scales and this makes me think that he is being bullied by another fish! The thing is there are only 3 albino cories, 3 ghost shrimps, a blue mystery snail and a single female guppy in there. Now, I know its not a good idea to keep him with the guppy but something happened with my guppy tank and she was forced into there and they have been getting along (so it seemed) for the fast 3 months. Is it possible that the guppy is causing all this damage? I didn't think guppies were fin nippers... and I don't know what to do with the guppy if she is the problem. And if anyone has any advice on getting my boy Henry's fin back up and beautiful I would really appreciate that. Thanks! EDIT: This is a 10g tank.