The Electric Blue Hermit Crab is a very popular Hermit Crab that is very active in the home aquarium. Their legs are colored in brilliant bright blue, and black. In the wild, these crabs live together in the hundreds and cling to rocks, and each other, during high tides, and then search for food during low tides. They should be offered algae sheets on an every other day basis in order to help feed them. As they grow they will need larger shells to take the place of the shell they outgrew. Most of their day is spent as scavengers and they do a tremendous job keeping aquariums clean of detritus and waste build-up.You can keep one to two Marshall Island Electric Blue Hermits in your marine aquarium. They are voracious algae eaters.