Clibanarius tricolor. The Blue Hermit Crab (AKA Blue Leg Hermit Crab) is a standout addition to any *saltwater aquarium, thanks to its unique bright blue legs with black banding and its eye-catching orange antennae. Its not just about looks though; this crab is also incredibly useful for keeping your tank clean. Hermit crabs make their home in empty shells in the aquarium, and have an interestingbehavior of switching shells, upgrading to a bigger size as they grow. As the hermit crabcrawls around the tank they drag their shells and stir up the sand. The Blue Hermit Crabplays a crucial role in aerating the sand bed and is a valuable member of your GeneralClean Up Crew. Blue Hermit Crab are also algae consumers and will diligently eat algae off youraquarium rocks, including troublesome green hair algae and cyanobacteria, helping tokeep your rockwork clean. In tanks with lower algae availability, it will appreciatesupplemental feeding with dried seaweed. If you are looking for a full cleanup crew you can shop our Saltwater Invert Packs. *The Blue Hermit Crab, and all our inverts, are for saltwater aquariums only. All invertebrates have an arrive alive guarantee. Due to variations within species, your item may not look identical to the image.