Hope someone can tell me what this is on my green terrors tail. None of the other fish on the tank have anything on them that I can see. It looks like a white zit, it started as just a blemish that I thought it got from fighting with an Oscar that has since been re homed. I treated it with paraguard for a couple of days (this is what my lfs sugested also salt and heat up to 85. I have not seen any improvement. Please help.