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IF he rips off his whole fin, he'll have trouble swimming, get him in shallower waters, and treat lightly with aquarium salt.
Before he does that, keep him entertained. Put a ping pong ball in the tank if necessary, play chase-the-finger with him, add interesting objects (like plushies or toy models or anything he probably hasn't seen before) around his tank, and change what is outside of his tank every day or so. Do whatever you need to do to keep him occupied and happy with his mind off tail biting.
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