acitydweller - Good point, being hermaphroditic, once fertilized they will remain so for a very long time even without further contact with other mature snails.
This is why I'm segregating them in an attempt to get a true breeding line of the color I like.
Of course the work ethic is the same in all of them, tireless algae eaters. They leave healthy live plants alone and even prune dead leaf stems after I trim plants. They get were my SAEs and Amano shrimp can't.
I always smiler when people freak about snails in their tanks.