Another recent posting in our forum prompted me to start an article on the wonderful helpers in my tank. Most reefers will think on Astrea, Turbo, Tronchus snails they need some reef-safe algae grazers for their tank. However I would like to take this opportunity to share about the collonista snails. Classification: Biota > Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Vetigastropoda (Subclass) > Phasianelloidea (Superfamily) > Colloniidae (Family) >