These beautiful little snails are great algae eaters. We watch them eat slime algae off rocks in the wild and off of our glass in captivity. They are true marine nerites. These snails do not get very big; about the size of a woman's thumbnail. We have found at least 6 different beautiful shell designs and personally collect them in the Florida Keys and locally. They have been known to reproduce in captivity. The Virgin Nerites are native to the Bahamas.  The story has it, from the source, that Julian Sprung had collected several of these unique snails on a trip to the Bahamas and released them in Florida. They are doing quite well in their new, transplanted home. THEY WILL NOT CLIMB OUT OF YOUR TANK!!