Aquatic Arts Ultimate Algae Cleaning Crew for 30 to 55 Gallon Aquarium - 3 Different Types of Snails! (Zebra Nerite Snails, Mystery Snails, and Black Devil Snails) This combo pack includes all of the very best algae-cleaning snails that we carry! See product description for details on everything that's included! The snails included in this pack should easily be able to keep a 30 to 55 gallon aquarium clean of algae. Produced by a hobbyist with years of experience in real aquariums. Each of these types of snails was specially selected to create the ultimate algae-cleaning crew - plus, they make very attractive additions to any aquarium! All Aquatic Arts (formerly InvertObsession) brand plants and animals come with a 100% live arrival guarantee, plus free email support directly from the owners!