Midnight Mystery Snail The Midnight Mystery Snail, or less impressively named the black mystery snail, are hardy and excellent scavengers with a dark black color pattern. These snails can handle a wide range of water and temperature conditions. Be sure to pull out snails and other invertebrates when treating the fish tank for ich and other disease. Scientific Name: Pomacea Bridgesii Origin: Asia Lifespan:  4 years Max Size: 2 inches Food: Frozen, Algae and Detritus Shipping Size: Approx. 1/2 inch to 3/4 inch