The past 3 weeks or so, I've noticed an area on the oscar's head that was turning white, like the scales have fallen off. It started off very small and is now the size of a dime. The other side of the head was fine until now; there is also another white spot that's starting to form. Can anyone explain what that is and how to treat it? I've already tried metronidazole since I thought it was hole in the head, but that doesn't seem to be it. Thanks.
