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Message: <blockquote data-quote="maryl1" data-source="post: 1552355" data-attributes="member: 242988">Try moving him to a different tank where he is alone for a while to see if he improves. Some fish are more aggressive even if they are small. My mother had a oscar once and it was a huge fish, It started to rot from the outside, it had huge holes in it body. I do not know what causes this or if there is anything you can do. I would try to move him to a different tank anyway because if he is sick you don't want the other fish to catch it.</blockquote>