Aquatic Arts 5 Zebra and Assorted Thorn/Horned Nerite Snails (Clithon corona/diadema/sp.) (1/4 to 3/4 inches) - Live Snails Comes with an assorted mix of Horned nerites including the popular zebra thorn nerite! 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!