My Oscar started attacking me for the first time yesterday when I was scrubbing algae. First he bit me, so I bapped him with my finger right on the nose. He tried to come back at me, so I stuck out my finger and spun my hand around his nose so fast he couldn't get a lock on the finger to bite it. He scooted off in frustration. Then he came back for more, and got the same. He figured out pretty fast that he wasn't going to be able to bite the spinning finger. Maybe you could try that on your little buddy. Might work for awhile, at least. Don't be afraid to get close, he hasn't got a chance in heck as long as you're very fast. And when you get near the eyes, it should really deter him.