HELP! Crab ID (sorry no pic yet!)

[spotted_drumfish]

Hi all! I have recently discovered a hitchhiker and I'm not so sure he's very good for the tank.. It's definitely a crab.  It's white/beige mainly, with medium to dark brown "spots" (not like a leopard but kind of striped like that).  It's hairy.  the arms are fairly large compared to the legs, and the pincers are dark brown and the claw has 2 "fingers" (not sure what they're called?).  Anyways, if this sounds familiar i'd love some help on the subject to see if he's harmful or not? I found him surrounded with empty shells, im thinking get rid of him? thanks in advance!

[OttawaReefer]

check here: http://www.wetwebmedia.com/swcrabidfaqs.htm

Without a picture it's hard.  A lot of crabs are not reef safe, but depending on what you have in the tank he may be fine

[salvini55]

were the empty shells full before hand? if so id get rid of the crab. what color are its eyes? red is bad

[Vincenzo.]

i love hitchhikers, and id be glad to help you...
but the lack of info i can help much..

is it out and about during the day? what color are eyes? are the pincers pointed? or spoon shaped? whats the size?