Check out this awesome hitchhiker my friend Cindy gave me. I think it's some kind of Xanthid egg crab or reef crab. I'm pretty sure it's not a good crab for reef tanks, though. I think it's pretty; it reminds me of a Jawbreaker candy. I'll keep it with my other bad crabs in my sump.
Did you know that many colorful Xanthid crabs are poisonous?