I'm not sure of the name, but go with those little black snails, they are the size of an eraser head. I have about 60 in my 135g. Don't go with any snails bigger than that, if you want coral, as those big fellas absoultely destroy coral. Also, regular water changes and a 36w UV
sterilizer will guarantee an algae free tank. Some people do not believe in the sterilizer, but I and all my clients swear by it. Crystal clear water and sand and tank. $70 delivered, with an extra pump, from eBay.