my oscar has some sort of worms, help please???

[Axle]

hi, i have had my oscar for about ten months now and i just bought another one and introduced them into my nice new tank. however i noticed that my new fish started excreting these white worms similar to small tape worms but oddly shaped. This oscar lost its appetite and went slugish spending most of its time on the floor. About 2 days later it died. I have noticed that my old fish who i really love is starting to become sluggish and sits on the bottom sometimes. im really scared that he has worms now and might also die. can anyone identify what it might be? is there a product to treat such worms?

thanx Axle