I've got an O that is just too tough for anyone I can putwith him. 75g tank and about 6-7 inches long. A few weeks ago I posted about my O getting bored like my Doberman when I stepped out for a half hour and locked her in the living room and she shredded my couches. Same thing except my O was in a 55 and he shredded my pleco from the underside which seems to the be the only vunerable spot on his body. So the thing is my O was with a LMB and he was a BAMF my bass went to my aunts farm bc she's got a huge pond we fish on and stuff My O seems diffrent so I cleaned a pingpong ball and put a hole in it so it will sink and then I took another and ran some sewing thread thru the center of the ball and suction cupped it to the bottom. He moved around more and fights with the Ping pong balls but what can I put in there to keep him company on the native end having the bass was the bed thing I ever kept so if I can find a mean natve I can catch near IL Iwould love it