Royalreefs Saltwater snails for sale are marine gastropods with shells. The shell of these saltwater snails protects them from hermit crabs and other predators. Saltwater snails breathe through a gill or gills, however, some saltwater snails have a lung. In your aquarium, each one of these saltwater snails for sale will serve a purpose in eliminating or controlling the growth of nuisance algae and keeping any uneaten foods from decomposing. Check out which saltwater snail will be best for your aquarium. Keep in mind if you would like to get a better deal on a variety of snails and hermit crabs check out our clean up crews as some have free shipping.