Crab ID

[Icefire]

From a friend:

 

[bertoni]

http://www.reefkeeping.com/issues/2003-12/rs/index.php

That article goes over basic crab shapes. The picture you posted looks majid-like to me.

 

[REMF]

I vote for Grapsid? Cool looking little guy non the less.

 

[Aliie]

How about I have no idea but a cute little bugger!!

 

[LeslieH]

It looks like Glabropilumnus dispar, family Pilumnidae. Probably your typical oportunistic predator. take a look at this pic and see if you agree:
http://www.flmnh.ufl.edu/reefs/guamimg/crustacea/crusties/Pages/Image49.html

 

[Icefire]

Look like it!