Fighting I belive, I think because of the shape of his tail it looks just prone to weakness in a fight. He has been moved between my plec community tanks and although growing well, his tail just gets worse
u say fighting ? with what? I have a pleco, not the same one , but similar and it jumped out of my tank. I get home and he looked dead. i picked him up and started moving. i put him in the tank, he was looking really bad. his tail and fins were broken. i thought he was gone. but he healed up and everything grew back in a few weeks. i really don't know why your plec's tail is getting worse though. maybe he'll get better.sorry i cant really help
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