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Hi, I have a 75 gallon, heavily planted tank with Siamese flying foxes, australian rainbow fish, gourami, and 1 unknown algea eater, this tank has been doing great for a while now, at least a few years, plants are flourishing, rainbow fish are great and all others were in great health, we havent added any new fish or plants into the tank for at least a year. About 2 days ago, i noticed 1 of my little flying foxes swimming upside down on the bottom of the tank, his dark brown top became very pale, and he seems to switch while he's swimming. I think I may have caught him too late, but what could be the problem, and is it possible to treat or should I just expect the worst thanks.