I just got my Oscar about a week ago and has been doing fine up until now. She is hiding in the back of the tank and at the bottom and her fecal matter is white and stringy, I don't notice anything on her fins or any where else, But I do Know shes not happy. I've had Oscars in the past and loved them dearly but lost them in a house fire years ago and didn't want to get anymore till I saw this one. I just had to get her now that I got her I don't want loose her. I treated the tank with a parasite guard,when I thought maybe I should have tried something else but I'm not sure any one have any other ideas?