Just spotted one of my koi doing flips endlessly, upon further inspection it looks like his tail is broken. Is there anything I can do for him? He'll still eat if I guide him to food, but as far as swimming he can't do anything but flips which doesn't sound very good. Looks almost like his something broken on his spine. My other koi aren't going after him or anything, not sure if he was bullied up on to do this or something else is going on.