What food have you tried?
He is pretty. You mean to say that you did not notice a cut that large before now? I would highly suggest trying to find some live black worms as already mentioned.
Good food is coming Mr. Potters. ..wishing him of her luck.He still hanging in there... I get the easy masstick today, and I found a store with live black worms. I will pick that up at lunch time too.
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Gash may not have been there when you got it. I've had fish develop body ulcerations a few times that look like a gash.