No more fish IMO
Floating ping pong balls are good when teathered to the glass bottom IMO because my Oscar speedbags the ball however anything sunken is good if he has room to roll it around the tank, I use a 3" PVC elbow Reflections are great as well IMO and when all else fails I throw a night crawler in and he spends 5-10 mins trying to keep it down like pasta that just keeps crawling out of your mouth Eventually from all the inhaleing and exhaling the worm takes such a beating and somtimes breaks in two in which case he fights one until its eaten and then fights the other one I also bribe my oscar to jump a few inches above the surface to snatch pellets from my fingers and before I feed pellets I like to move around to initiate some primal chase