[framerguy]

I checked several references and it seems the Nas D. is extremely difficult to breed. The Nas sp. seem prolific at breeding but the larvae rarely make it to maturity in an aquarium. Most varieties of snails will deposit eggs with a similar fate. One way to make an artificial incubator is to put a snail upside down in a cup of warm seawater (80 deg. far.) for a few minutes, they pour this water off and add cold seawater ( 60 deg. far.). Some will emit sperm while some emit egg masses. once you have both varieties, mix them together and watch the eggs develop into swimming larvae. It takes a couple of hours! That's where my info ends though, I couldn't find how to raise them, just make them.