The Scarlet Hermit Crab is a very active cleanerl and makes a terrific addition to any home tanks. Its appendages are the most beautiful thing to see, since they are a brilliant scarlet color. The Scarlet 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, it not only clear up the surroundings but also help aerate sand substrates thereby encouraging growth and activity of beneficial bacteria. The Scarlet Hermit Crab loves to hide behind rocks and thus large rocks are essential to keep in every reef tank. It undergoes a molting process where it sheds its 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 Scarlet Hermit Crab has the extended abdomen and they spiral up themselves in it and expose only the head and its claws. When it is 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 are present then the Scarlet Hermit Crab must be provided with dried seaweeds, and should be kept in groups for larger aquariums. It is completely reef safe and is peaceful in nature. The Scarlet Hermit Crab does not harass or harm any other inhabitants and are very safe to keep in a reef tank along with other inhabitants.