Our parrot fish has started acting very strange. I noticed his color getting pale and he started just floating with his head down toward the gravel. I also noticed he now has big white spots on his head. It's not ick,I'm sure of that. I do not know much about hole in head disease so I'm not sure if that is the issue or not. Our tank is maintained well. Our nitrate level is a bit high. I'm wondering if this is indeed the hole in head disease or something else. Any help would be greatly appreciated.