i have 2 oscars and 2 catfish they r all white.well my oscar(1 tiger oscar 1 albino)

was acting a little weird but yesterday i put some food in there and he came up and ate a little .i could have cried i was so happy first time he did that since i brought him.i do think he was a little sick so i put some jungle stuff for fugus.well the oscars look a little better and he's eating a little.but now i notice that my catfish one of them eye is red just one of his eyes and he's just layin around the other one is trin to make him move around.i dont want that catfish to make my oscar sick do u all think i should take the catfish out .can he make the rest of my fish sick.my oscars have came 2 far in the 3 weeks that i had him.they r in a 55 gallon tank