I have 4 koi angels that haven't been getting along and there is one pair in the 4. I noticed today that the Male of the pair has that white fuzzy stuff on his mouth. All my other fish are healthy and all my numbers are great in the tank. I took the male out and put him in a 29 gal tank but my question is what should I use for this condition on an angel. Also, should I put the female in with him so they're not seperated.