[framerguy]

Nassarius Sp. ( nassarius snail)
Sz: 1/2"
MTS: 10 gal.
FF: Left over food and decaying organisms
RC: excellent reef animals, will not attack healthy animals
nassirius snails are found in all seas. They bury themselves in the sand to sleep and "pop out" when food is introduced to the tank. They are excellent for substrate oxygenation. Will not eat algae. I've read conflicting reports on their detritus feeding habits. They may or may not.
They have no lighting requirements.

Cerithium Sp. (Cerith snail)
Sz:less than 1"
MTS: 50 gal or larger
FF: Detritus, several types of algae, decaying organics, fish waste,
RC: among the best snails for the reef tank
Excellent reef snail. Will eat a wide variety of organic material. Will also plow through the sand searching for food which super oxygenates the substrate. Require lighting to sustain algae growth.

I hope you find this information helpful in choosing snails for your aquarium.

The stuff in blue is why I chose cerith snails for you.