Hairy emerald crabs are the reef variety of the common Mithrax sculptus crabs that are used for bubble algae control. Although they are probably a different species than sculptus, they pretty much look and act the same as sculptus, and can serve as a substitute. The carapace is a lighter green, and the legs are dark and very hairy, as seen in the picture.
Like the other common mithrax crabs, these crabs eat algae, not coral and anemones, so they are reef compatible. They will also readily eat foods presented to them or that thy find lying on bottom so they are real easy to take care of. As with other mithrax crabs that we sell, we tend to ship just the smaller ones that are in the 0.5 to 0.75 inch range.