12 Live Assassin Snails (Clea helena - 1/2 to 1 Inch) - Removes All Pest Snails! by Aquatic Arts Removes snails if unwanted, including Pond Snails, Bladder Snails, Ramshorn Snails, Malaysian Trumpet Snails (MTS), and more. Beautiful black and yellow coloration. Will not attack anything but snails - safe with shrimp, fish, live plants, etc. Useful in shrimp tanks/etc where snail-killing chemicals cannot be used, or if you don't like using harsh chemicals in your aquarium. All Aquatic ArtsTM (formerly InvertObsessionTM) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!