Tony,
I can not say for sure, as I have several different kinds of snails in the tank. I can say that I actually watched a Nassarius lay the eggs on the glass and they hatched out about a week later. Surprise #1 because I had talked to a guy in the States that told me they release sperm and eggs into the water. I have two baby snails in the tank now. One is brown and white with a Margarita type shell. The other has a whitish shell fairly long body two small antenae and an elongated shell. It could be a cerith, but the body does not look right. I can not see the "snorkel" that the nassarius has. That may take time.
I will try to get some pics of both snails and post them up.
Cheers,
Al
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