The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
My Oscar keeps going to the surface and "spitting" at his hood. Why? It sounds like a pebble hitting glass. My roommate even thought he was throwing small pebbles at one point. He is 2.5 to 3 inches long.
Or he could just be amusing himself. Oscars are very much like managuense (jaguar) cichlids, very intelligent and will find ways to keep themselves entertained.
Get him a clean ping pong ball to play with. Or even a large marble.
My old jag would roll a round rock all over his tank. Then he'd build up the gravel on one side, push the rock up the "hill" and let it roll down. He'd push it around the tank a few times then do it all over again.