While it's nice that you are doing the right thing for these puffers, I'd recommend discussing the deplorable fish conditions witht he managers rather than encouraging them to perpetuate them by buying livestock.
I discuss the betta bowls, GSPs, Violet Gobies, Pacus and Oscar labels & housing pretty regularly w/ my local WM management. To their credit, I only rarely see GSPs & Violet Gobies in there anymore... still need to work on those tags claiming RBPacus grow to 10"...
PS - I agree w/ the above - from what I've read, the puffers will eventually hunt down & kill just about anything else you could put in there (that doesn't kill the puffers 1st), so plan on a species tank. Having lots of visual barriers in tank (tall plants etc.) will help keep aggression between the two down somewhat, but don;t be surprised if you are in need of a home or another tank for one of 'em later.