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Scientific Name:     Mithrax sculptus
Family:                   Crustaceans
Common Names:    Emerald Crab, Mithrax Crab Description:
The Emerald crab is easily recognized by it's green heavily sculpted body and large heavy claws.  It has noticeable hairs visible on its hind legs.

Natural Environment:
Tropical western Atlantic

Care:
Reef Suitability:  The Emerald crab is a good scavenger for reef tanks.  They are primarily herbivores, but like most crabs emeralds have the ability to eat things they shouldn't, and are occasionally accused of picking at corals. They are primarily nocturnal and usually spend the day hidden in a crevice, coming out at night to feed.   

Disposition:  Generally get along well with other tank inhabitants. In general, the larger the crab, the more likely they are to become a problem in the tank.

Feeding: They are primarily nocturnal algae eaters and spend their nights eating various algae's in the reef tank including hair algae, macro algae and even bubble algae which is their main claim to fame.   I would not count on them for a total control solution for bubble algae, but they can play a part.

Hardiness:  Very hardy providing they have algae on which to feed..  

Temperature: Does well within normal reef tank temperature ranges of at least 75-84°F.

Information provided by www.reefcorner.com