Hitchhiker Crab - Good or Bad?

[dough01]

I bought an acropora from Barrier Reef yesterday and found an interesting hitchhiker on-board this morning. The crab itself looks harmless but you can never been took careful. The picture came out ok but doesn't do it justice. It's actually a good looking crab. It's shell is like porcelain and goes from a white to an off-purple. Does anyone know what this crab is and if it is ok to leave in my reef?

 

[returnofsid]

Looks like an Acro Crab to me. They're not only harmless but great to have!! Check out this link for more info.

http://www.wetwebmedia.com/acrocompfaqs.htm

 

[ReefferMan]

Ive had a few of those lil buggers, long as they dont have blue eyes! the blue eyed ones are bad! they like to eat acro's ive had some devistation due to them. Mine were fuzzy and changed colors. Good luck! Happy Reeffin!