i have some young oscars.. that may be developing hole in the head.. i originally thought they were cuts or scapes from the slate in the tank but its been some time now and they have not healed and i'v notice a few more. They arent holes yet and its been over a month so im suprised but i guess its time to move along to some kind of treatment before it gets out of hand. What are some recommended preliminary treatments? since it is not full blown hole in the head id prefer not to do crazy treatments if not necessary. I've started doing 20% water changes every 2 or 3 days to ensure tank remains very clean.