I have a 75g tank and I think 3 of my fish has diseases. one of the Neon Tetras seem to be deteriorating, pale in color and just looks horrible, refuses to eat and what not. is this the Neon Tetra Disease? another Neon Tetra looks like it's extremely bloated, maybe just pregnant but also might be infected with some sort of bacteria or something. the last one is my wild caught adult female Sterbai Cory, she's the only one that has her skin getting "peeled" off. it's on the top of her head and the tip of her nose. they made their home underneath the heater so this might be the culprit, burning her and such. it just looks like she's balding, her nose is white and so is the top of her forehead. any help would be appreciated. thanks.