Fish don't need toys..A bored fish can be destructive and thats because his living in an enviroment that's is not adequate for him. It could be the lack of other fish, proper gravel, wood, leaves, rocks, whatever...A ping pong ball is not natural and a fish is not like like a dog that can recognize the ball as toy and might see it as a threat making him even more stressed or nervous. Donesn't make any sense to me giving toys to a fish to play with...