we have a hawaiin puffer, he's a calm as can be, likes to be hand fed. BUT...they are not reef safe....keep that in mind if you are thinking reef, the puffer is what is keeping us from going reef right now. Also keep in mind that they all have will get the big teeth sticking out of their beak if they don't get something crunchy to eat, and mine won't take the crunchy so I feed him off a rock, which is keeping his teeth 'filed', so far so good. Good luck!
(a funny thing...I put sea weed in on a clip and he goes right for it, and I can hear him biting it off if my head is at the top of the tank....suppose I could go in for a dip, but....na, sw would dry up my old skin!)