i once kept a squirrel fish with puffers. i think they're great fish to have if you're willing to meet some of their requirements. since they're nocturnal they would appreciate a dim lighting. they're quite hardy too. they're also schooling so you can put a bunch of them. my only problem was that he was such a voracious eater. he literally swam at the speed of light during feeding to get as much food as he could, not letting other fishes eat. also, they're easily scared, which is something i do not like in fishes. that's why i never keep fishes like tangs...but otherwise interesting fish!