I love those guys!!! I want one soooo bad!!!!!!
I'm eyeing a 55G so I can do a puffer only tank, well..Puffer's and lots of snails so they can keep their beak down.
The are messy so a super filter is essential, like higher PH water, more salt added as they get older, and will eat anything they can catch that will fit in their hungry mouths....Piglets!
They'd be cool in a divided tank though w/ a betta...watching them interact.