Puffers and what else?


I have a 56 gallon, 30x18x24, I'm considering making it into a FOWLR and being coral-free Im thinking mostly fish that aren't reef safe. Can you put more than 1 puffer in a tank? I was thinking a snowflake eel, a couple of valentini (or other small) puffers. I'm also considering a foxface rabbit if it will fit & wont be too mean or not mean enough :)
Other stocking ideas are also very very welcome :)