Hi flowerslegacy. Well, I took it back in to the LFS and they said bloodworm but I don't believe them at all. For one thing, it was way too long to be a bloodworm and for another thing, it was flattish, not round, and not segmented like a bloodworm. It also was missing the little head part that I see on the bloodworms I feed my bettas. It definitely does sound like whatever that person in the thread you found for me had, though. Thank you for finding that.
Also found a whole clutch of eggs in the bottom of the cup when I went to take it back to the LFS. They said snail eggs. o.O Ewww. I'm glad I made them take the cup and dump everything out because no way do I want that many pond snails in my tanks.
So for now, I put the corkscrew val in my fry tank and the rest are in the big platy QT tank. I'll leave them there for a day or two. Kind of in a pickle, actually. No sooner did I put the plants in the platy tank than one of the girls started popping out fry and now they are hiding in the plants. Must find new hiding spot for the fry before I take the plants out.