I actually just adopted out my six, haha.
You'll need more than one, I found they did best in groups of three and up.
The Hermit Crab Association is a great website as well, there are tons and tons of crabbers who have helped me out more than once. (: Good luck Vamp! They're really quite fun, really.
edit; Also, I don't think there's such thing as "too big" tank-wise. I had six in my 29gal, and before that kept three in a 10gal.. you need to be able to provide at the very least four inches of wet sand and coconut fiber. (:
♂ Nettlestung ♥ Pastel/Cellophane HM [RIP]
♂ Stormrunner ♥ White Marble dtVT [RIP]
♀ Willowisp ♥ Cellophane Marble VT [RIP]
♂ Skyshatter ♥ Butterfly Halfmoon [RIP]
♂ Starchaser ♥ King Plakat [RIP]
♂ Heartseeker ♥ Red/white DeT