Pleurocera Simplex Simplex

This is the smallest snail that I have ever seen! but a must have at our place. They are tiny guys with big appetites!! these guys are only 1/4 inch in size and their shells look like its made from black metal , but their tiny mouths are a bright orange!  50 snails, are enough for a ten gallon tank. THEY LOVE TO EAT HAIR ALGAE!!!!!!!!!!! THATS THE BEST PART!!!!! Their shells will turn a lighter color in warmer water, and a darker color in cool, or cold water setups.