Take a look at my little friend here and let me know what you think. I've had mixed opinions on live rock crab tag alongs and am still undecided on what to do with them all. There are more in the rocks! Besides this one, there is a greyish hairy one, a light colored one with a dark face, and a dark purple hairy one. All are about 1 to 2 cm or so.
http://picasaweb.google.com/lh/photo...eat=directlink
http://picasaweb.google.com/lh/photo...eat=directlink
http://picasaweb.google.com/lh/photo...eat=directlink
And if you want to snoop those links will take you to other photos of my tank at various stages.