Aquatic Arts 5 Sun Thorn Nerite Snails (Neritina natalensis aka Horned Nerite Snails - 1/4 to 1/2 inch Diameter) These snails come in different colors and patterns and feature 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 in the aquarium hobby. They are particularly effective against algae on hard surfaces, such as glass. All Aquatic ArtsTM (formerly InvertObsessionTM) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!