My oscar is the only fish I have that does this. No one can tell me that he can't see well. He will charge the side of the tank the TV is on if he doesn't like what he sees. If I go over to the tank and talk to my oscar (Rebel) he will get a rock in his mouth and grind it in his teeth. I really think he is trying to communicate! AND NO I AM NOT NUTS!

He will just sit there staring at me grinding his rock while I am talking to him. (For the record, I talk to all my pets except one of my tarantulas. He doesn't like my voice and will jump at me if I talk to him. He is the only tarantula that I won't handle. Mean little bugger!!)