well as far as tank siz minimum is 180 for ONE SHARK, no more, maybe 1-3lbs of lr per gallon, becuz sharks r messy eaters and ull need good filtration as well, coral cats and marbled cats r nice and two of the smaller sharks in the trade i no of a place that sells em for $80, pretty cheap compared to some places. as far as tankmates go, u can do anything except triggers, puffers, and large angels. a school of sapphire damsels might look nice, or a trio of sunburst anthias. maybe a tang, ray if u got a bigger tank, a dragon eel would look cool if u have the budget lol. ull want a sump and refugium. diets meaty food like shrimp, fish, squid, octo, ocean nutrition shark formula is a good thing. oh and to get him to start eating soak his food in garlic, kick start his feeding response[/QU
Some puffers are diffrent I have a spotted puffer in with a cat shark and there great together.