The Astrea Turbo snail is one of the smaller, more commonly used algae eaters in the saltwater hobby. Astrea snails will help clean your glass of algae and will also feed on nuisance algae in the aquarium, including cyanobacteria and diatoms. These snails prefer environments with sufficient rock work for maneuvering around the aquarium, and unlike Trochus snails, generally cannot flip themselves over.