The Arrow Crab is brown in color with claws that are usually tipped in purple. They have a small triangular shaped body with a pointed head and long hinged legs. Their legs extend straight to keep predators at bay. Arrow Crabs are tremendous scavengers and are sought after for their diet of Bristle Worms. They are very easy to care for and frequently found hiding in floating Sargassum in Florida and the Caribbean. Only one should be kept per tank and they should only be kept in larger tanks.