I picked up 2 Otos yesterday for my 29 gallon tank and I noticed that one of them is missing part of his tail. He's super active, eating fine and not acting strange. Should I just leave it be and hope that it regrows now that he's in nice clean water or should I add anything to help him recover? I have some Kordon Fish Protector, if that would be helpful. Here's a picture showing both Otos together so you can compare their tails.