Aquatic Arts 10 Japanese Trapdoor Snails (Viviparus malleattus) (1/2-2+ inches) - Live Snails All Aquatic ArtsTM (formerly InvertObsessionTM) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners! Japanese Trapdoor Snails are excellent at keeping your tank (or pond) and any live plants free of algae with minimal damage to the plants. Can grow up to 2 inches or more in length! These snails' shells are spiral-shaped, but otherwise they vary in appearance - each snail has a slightly different pattern and coloration, and no two snails are exactly alike. In addition to eating algae, they consume uneaten fish food and waste on the floor of tanks and ponds!