X5 Opal Asian Freshwater Clam Package - Fresh Water Snail MysteryX5 Opal Asian Freshwater Clam Package Fresh Water Snail Mystery Recommended Tank Parameters pH level range: 7. 6 to 8. 4 Temperature range: 68 to 84 F Water type: kH 12 18; gH 8 18 (Mystery snails do best in hard water) Notes from the owner: Snails are very sensitive to copper, so watch out for copper if you use tap water in your tank. They also need a decent amount of calcium in their water to maintain their shell health, which can be helped by