The Electric Blue Hermit Crab (Calcinus elegans), originates exclusively from the Marshall Islands. This crab has electrifying blue legs and its antennae stand out with its bright orange color. The Electric Blue Leg Hermit Crab is a valuable addition to an aquarium because it will eat algae including green hair algae and cyanobacteria. In addition, it provides valuable aeration by sifting through the sand. This is one Hermit Crab that is reef-safe.