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Baita fish

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I got a baita fish about 1/2-1 year ago. Today I have found my fish swimming on its side. I know its alive because I just fed it and it ate the food and I can c it swimming. What wrong with my fish and he has a large bump on his stomach(a fin comes out of the bump. But when I got him the bump was smaller it also is not always this big)...whats wrong with him??