Aquatic Arts 5 Black Racer Nerite Snails (Neritina natalensis - 1/2-1 inch in Diameter) These snails' shells are a gleaming ebony, adding a sophisticated beauty to any aquarium. These are Nerite Snails, so they absolutely never reproduce in freshwater - great for aquarium hobbyists who don't want snails reproducing in their tanks! Totally safe for live plants, live shrimp, and live fish. Nerite Snails are widely known as one of, if not the most, voracious algae-eaters out of any snail. All Aquatic ArtsTM (formerly InvertObsessionTM) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!