Aquatic Arts 5 B-Grade Nerite Snails (Neritina natalensis) in Assorted Colors and Patterns These are Nerite Snails, so they absolutely never reproduce in freshwater - great for aquarium hobbyists who don't want snails reproducing in their tanks! Nerite Snails are widely known as one of, if not the most, voracious algae-eaters out of any snail. Each type of snail ranges from 1/2 to 1 inch in size. They usually will remain around 1 inch throughout their lifespan, but the occasional snail will reach 1 1/2 inches! This listing is for B-grade nerite snails, meaning that the snails may have minor shell damage or calcification, but are otherwise perfectly healthy All Aquatic ArtsTM (formerly InvertObsessionTM) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!