i came home today and found my 5in GT swimming around upside down!!! i though he was dead at first, but he's still alive. moved him to the med tank, but i can't find any visible signs of disease (finrot, ick, fungus...etc)!!! water para. are: ph 7.0, nitrites 0ppm, and nitrates 20ppm (the usual for this tank) can anyone help me identify this? symptoms are, disorientation (swims sideways or upside down, mostly lies on the bototm of the tank), discoloration (he's grey now), no appetite, and his anus is red. i'm thinking someting internal, no signs of dropsy (thankfully) i have no idea what kind of meds to give, applied mel/perma fix and salt, what else can i do?