4 Zebra Nerite Snails (Neritina natalensis) - Great for Algae and Plant Safe - Will not reproduce in fresh water! Great snails to introduce to your tank to help control algae and look magnificent Beautiful shells that will stand out against dark substrate and planted tanks Nerites need brackish water to reproduce, so they will not overpopulate you tank Snails will be 1/2" or larger in diameter One of many snails that we carry and all of our purchases come with Live Arrival Guarantees!