Don't let MTS's fool you. They will bury in the substrate (very good for live plants btw) and come out at night. I thought my snails in one of my other tanks were all eaten til I came down for a midnight snack and saw the glass covered in them.
MTS's do live birth, no egss. The little guys are sooooo tiny.
And the pond snails are so small and they go undetected til to late.
I believe both are asexual too - no mates needed. One can do it all