My Flame Hawkfish has developed what looks like white patches on his body and fins (about half to a quarter the size of a pencil eraser). There are about 5 of them now. They don't appear raised like a growth. Any ideas? Doesn't seem to be bothering him....still eats fine...no scratching. Other fish appear fine as well. They are definitely multiplying though. The symptoms don't seem to match any of the common marine fish diseases.