I had a belly crawler that hated everyone but he wasn't a real glass banger. They're really cool though.
Problem is puffers that would work in that tank are pretty boring. They sit and wait to ambush prey. I have a hairy puffer that I love but would not put him in an area with a lot of traffic because there is just not much to see. But if you dont mind a pet rock, puffers can be interesting and the lurker types easy to keep.a puffer would be cool are they easy to maintain?