I've thought about if I could find a small enough remote controlled water toy, I'd give him something to chase sometimes. I have lots of big crystals and shells, some small stones for when he decides to redecorate. I should try my cat's laser light toy with him, see if he'll chase a laser dot. He has a history of destroying tanks. That's how he ended up at a lfs. I knew about it when I got him and set it up for him to be able to rearrange it easily. Just wish, he'd leave the filter tubes alone.