Hello all, My gramma when I picked him up from the LFS had a tiny spot on his tail and tail was a bit frayed. I thot it was a result of being picked on (and probably was) and that it would heal. I have had him for a couple weeks now, and although he acts happy, the fins have frayed even more and he barely has a tail, and the base of his tail is a lighter yellow than it should be. Is this probably a secondary bacterial infection as a result of injury, and if so, how should I treat him???