The Giant Red Leg Hermit Crab, Dardanus sp., are found off the Caribbean coast living together in the hundreds. They will spend their time in the home aquarium clinging to rocks and each other scouring for algae and other food. As proficient tank-cleaners, the Giant Red Leg Hermit Crab is an essential member to any clean up crew and have no real drawback of keeping them in your tank. Make sure to keep empty shells on hand so they have opportunities to size up otherwise they make try to take snail's shells.