Saltwater crabs are a large group of invertebrates within the decapod crustaceans family, consisting of several sub groups. From hermits, stone crabs, porcelains, sally light foot, anemone crabs, mithrax to name a few. This wide range of invertebrates can vary in size from small to very large.
These crustaceans are well known for their fondness of algae, detritus and left over food and waste, making them a great solution for the home aquarium for excess food and waste removal. However most of the crabs in the trade are omnivores and will eat whatever is available to sustain life. Care must be given when choosing invertebrates for your aquarium to insure that claws are not large enough to catch small fish and other small invertebrates.