The Blue Leg Hermit Crab is a very active water animal and makes a terrific addition to any home tank. Their appendages are the most beautiful thing to see, since they are in brilliant blue, orange and black in color. The Blue Leg Hermit Crab is considered as very good scavengers as they feed on detritus and waste build up, especially on algae and Cyano Bacteria. By doing so, they not only clear up the surroundings but also, help aerate sand substrates thereby encouraging growth and activity of beneficial bacteria. The Blue Leg Hermit Crab love to hide behind rocks and thus large rocks are referred to keep in every reef tank. They undergo a molting process where they shed their exoskeleton in order to obtain a new one. Often it leaves its shredded translucent shell which serves as a distraction while the crab finds a hiding place that allows the new shell to harden. Hermit crabs use the abandoned shell as their shelter. The Blue Leg Hermit Crab has the extended abdomen and they spiral up themselves in it and expose only the head and its claws. When they are sensitized by any predator, they coil up inside the shell and seek for protection. If these crabs are deficient of food or if seeking for new homes, they might feed on existing snails as food and achieve the snail as a shelter. If insufficient algae is present then the Blue Leg Hermit Crab must be provided with dried seaweeds, and should be kept in groups in a larger aquarium. These are completely reef safe and are peaceful in nature. The Blue Leg Hermit Crab does not harass or harm any other inhabitants and are very safe to keep in a reef tank along with other inhabitants.