recently i bought a albino Oscar about 3 inches in the store he was laying on his side and underfed so i decided to take him home and i put him in my 20 gallon temp tank until he got bigger for my pond. but now he is laying on his side breathing heavily. there is few baby angel fish in the tank and they are doing fine. i recently went back to the store and most of the oscars were dead i think they have a disease any way to help my oscar. my tank ammonia is 0,ph 7, nitrates 0 i want to save him guys pls help
