Mine was cream when I brought it home...and it's picked up a fairly nice neon pink color. I don't know if it's good or bad, but I've been target feeding him/the coral some filter feeder food...didn't know really what else to do. Figured it wouldn't hurt.
Staghorn crabs move around...carrying a coral...corals sting. If he was to touch another coral while walking around...well...not good perhaps.
Be careful b/c if he gets flipped upside down, he has no way to get back up if the coral on his back is large. Mine stays on the sand, so he doesn't fall or get knocked over until some other creature bumps him.