If you could give us a little more information on your tank we maybe able to help.
Have you tested your water? If so please post the results.
Does your oscar show any signs of illness besides the obvious of lying on the bottom. Is he eating?
Any sores or spots of fungus on him?
Any of this information would help us better to determine your problem and a course of action on treatment.
I have not had the water tested. The fish looks fine and acts fine at times. He does eat. The water temp is 78, the tank is a 200 gal with a large air stone. I have four oscars and two mollys. I put the mollys in about two months ago to test water.
Normal oscar action? I have two O's and have had them about a year and have never seen them laying at the bottom of the tank. They do rest at night hovering at the bottom but have never layed there as if dead. How long have they been in the tank?
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