Includes 5 Clithon corona Nerite Snails For freshwater tropical aquariums Clithon corona "Horned Nerite" snails are considered one of the best algae eaters for freshwater planted aquariums. Their small size and powerful rasping radula efficiently clear out tough algae spots and diatom growth on your decorations and plants. Horned Nerite snails rarely get bigger than 1/2 inch and come can vary in coloration from dark brown to yellow. Supplement feeding with algae wafers or pellet food.