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its possible, what is your cuc like?
Ive read they lay eggs all the time but shrimp and crabs eat em before they can hatch. you might have gotten lucky.
I would have to say you miscounted either when you got them or now. Even if they layed eggs as soon as you got them, they would still be tiny. Snail don't grow all that fast.
I agree with Larry. I have had nassis for a few years (saw them laying eggs....on the glass {and this was the first time I have every seen them lay them}...) and never got more than I bought. BUT, I'm not saying it is impossible.