Cerith snails eat both detritus and algae thus are greatly beneficial to your aquarium.
Cerith Snail (Cerithium sp.) Spawning on the Aquarium Glass.
Just like Nassarius snails, Cerith snails will spawn in an aquarium, although I have never managed to rear either one.
Further Readings:
Three Most Beneficial Snails for a Reef Aquarium
Last updated: July 3, 2014