Emerald Crab stays hidden within the recesses of the rubble upon where it resides during the daytime and ventures out in the evening to forage upon various types of algae. Within a reef aquarium environment the Emerald Crab quickly becomes adapted to the aquarium and will venture out more often to forage upon algae.Emerald Crab is most commonly found in rubble zones from a depth of less than a foot to about 8 or 10 feet of water. This species will generally occupy small crevices within rocks and live on the underside of coral rubble. The craggy texture of the Emerald Crab probably lends itself very well to the crabs defense. Another advantage that the Emerald Crab possesses is the ability to cling to the rubble it inhabits during rough weather. Emerald Crabs are sometimes found {although not as commonly} living in association with Condylactus Anemones.

Emerald Crab is a very interesting animal due to the fact that it can reside within areas of the ocean that many other invertebrates have trouble tolerating for one reason or another. In the wild we see these crabs tolerate water temperatures within the outer range of their habitat from well into the nineties to as low as 55 degrees Fahrenheit. They can survive within very heavy surge zones due to the clinging ability. Like so many Invertebrate species the success of the Emerald Crab is dependant upon the condition of the marine habitat. It is an extremely common species and will continue to thrive within a healthy environment.

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