Aquatic Arts 3 Black Devil Snails (Fanus ater) - 1 to 3 inches long - Aquatic Snails These large snails feature gorgeous, glossy shells that range in color from chocolate brown to the deepest black. Black Devil snails are relatives to the popular Malaysian Trumpet snails, but they are more similar in shape and size to Giant Sulawesi snails. Totally peaceful aquarium inhabitants, and totally safe for shrimp and other snails. Feeds on leftover food or almost any kind of fish food. All InvertObsession brand plants and animals (sold by Aquatic Arts) come with a 100% live arrival guarantee, plus free email support directly from the owners!