i recently noticed a small injury in my oscar's head and i'm not sure whether it's just a scrape or the beginning of something much worse. If it is hole in the head disease then how can i cure it? I havn't noticed anything on his tankmates (RD and GT) but i'm still nervous. Will Melafix work or will i have to use something different? What causes this disease? Any help would be much appreciated and im working on getting a pic of his face up. Thanks.