Sorry it took me so long to respond. Everything is crazy here, I'm getting ready for my first semester of college. I actually found three little guys in the substrate that I hadn't tossed. I think that should be fine because don't they reproduce like mad?
If you want some, i have a ton of babies and a handful of adults. i think im going to switch to ramshorns in my shrimp tank now so they are free to a good home.
If I can figure out a place to meet you or something (not having a car sucks majorly) I'd be more than able to clean you out of all of your MTS (for some reason, my bladder and ramshorn do amazingly, but MTS don't do so well unless I forget about their existence)