A quick update - 2 of the original 6 plants have survived. Here's a few pics.
The first is a Crypt ciliata (I think).
This other one I bought from AaronT, can't remember what is (sorry).
You can see in the pics that the HC is surviving, not growing much, but surviving. I've been keeping them on my back porch all summer, but I don't think they will survive the winter outdoors.