I have two oscars that have grown up together. They seem to have been buddys for about a year til now. My oldest and smallest of the two constantly pics on my bigger and younger one. Lots of lip locking and chassing around the tank sometimes making a huge rukus. They both clean the big flat rock and dig pits together and constantly twitch their heads back and fourth like something is pissing them off. My older oscar the smaller one sometimes swim across the tank and ram into the other oscars side and ends up pinning him to the corner of the tank where the one being picked on plays dead for a couple of minutes motionless, then goes back doing his own thing. This oscar is so aggressive that when I go to clean the tank or rearrange anything he rushes after my arm/hand and is quite vicious and persistant to tear my arm off. I have been bitten quite a few times and not see it comming and gives me a good jump. Could someone tell me if this aggression is spawning behavior or do I have a really bad tepered O? What should I do about this? Its just kinda sad to see the picked on one being so submissive and only fighting back every now and then. Any help/advice would be much appreciated. Thanks!!