Please Help!!i have a fish with a white/slightly red spot on its side and it is swimming around occasionally erratic.i had another just like it that had the same kind of spot on its gil and it died.another fish has turned more white then usual and its mouth is disappearing.i did water tests and have done normal water changes for the past few weeks,the tests look pretty good.i can't figure out what this is?i will include some pics.thanks to everyone in advance.