careful pacu like fingers, nets, .... shirt corners that brush the water.... just don't expect to stick something in the tank and it not get shewed one if it seems appealing to them. and im sure you can get a goldfish bowl full of pea puffers to go next to there tank. ( they breed and make good feeders ( ive heard some dumb things at a petco, fresh water morays 8 inch bearded dragons. i wonder if they ever wonder why this kid hit his head and left.... better yet why do i go back?)