I believe the snails that have reproduced in my tank are nassarius, but they've never gone into the sand bed as nassarius are listed as doing, so I'm not sure. Mine seem to mostly clean the glass and the top of the sand on occasion.
I sure wish the references gave through the glass pictures of their feet as well as shell shots.
Yes if the survive you may have 300 grain of sand sized snails. Congratulations.
My first hatch is reaching pink pencil eraser size at approx. 7 months. The second hatch is about 1/2 that size. I also still have a lot of small grain of rice sized snails as well. So I either missed a third hatch or some just haven't grown as well. I'd guess-timate that I've gone from 30-40 to 100-120.
When checking the tank before I started this post I noticed I have a couple more egg pods. I get the impression that there are 7-20 eggs per pod. Oops, I've just checked again, make that 33 pods. I'm fairly sure there were only 2 pods on the glass last night.
Don't know if it makes any difference, but most of the egg pods are on the end of the tank that gets a little natural sun just before sun set. I set the tank up in January, added the clean up crew in February and noticed the 1st egg pods in March. My tank doesn't get any direct sun light in the summer and I haven't noticed any egg pods for the last few months. A clue?
Randy