plant ID

I have a plant in my tank that I got from Petco 2 weeks ago. It was labeled Hygrophila but I don't know which kind it is. I was wondering what plant it was. Thanks in advance.

That does have the appearance of Hygrophila, and it could be H. corymbosa or perhaps H. polysperma which has smaller leaves than the former.

Thanks. I think it's most likely H. corymbosa because H. polysperma is illegal in the U.S.

I got some duckweed from my LFS a month ago and this little vine like plant was mixed in with the duckweed. I left it to float around my fry tank with the duckweed and it started growing roots. I'm wondering what kind of plant it is so I can better care for it. I know it looks like a random piece of a plant and it may not be identifiable. Thanks in advance.