Zebra Thorn/Horn Nerite Snails (Clithon corona/diadema) have shells with a beautiful black and yellow spiral pattern and a gleaming, glossy finish.  These lovely little snails are great for adding some shine and sophistication to your aquarium, but they also serve some very useful purposes.  They clean algae off of glass, plants, and decorations, they eat hair algae, and they keep your substrate clean and the correct color.

Nerite Snails are widely believed to be the single best snail in the aquarium hobby for eating algae.  They are totally safe with any fish, shrimp, or plants, and are completely peaceful.  Nerite Snails require salt water to reproduce, so they will never overpopulate your aquarium (as some freshwater snails are known to do).