Name this plant

I pulled this out of a local reservor while I was fishing last week. It's kinda fragile and it was hard to get one that I could pull the roots up out of, most of them broke. After a couple of days the leaves have started to turn green now. I don't know if it will last or not.

Can anyone give me an ID and any growing tips/lighting conditions for this plant. These are two differnt plants, but the same kind.

The photo is a little difficult. Can you add a photo that is a close up of the leaves and how they join to the stem? Also, the photo looks like the leaves are opposite from one another (as opposed to alternating along the stem). Is that the case?

I tried the best I could this morning. If you can ID from this, let me know and I'll try again. Yes, the leaves are opposite one another.

It looks like it has two different types of leaves, one submerged, one floating, or am I misreading the photos? Some kind of potamageton?

Growing tips/lighting would be consistant with those that exist where you found it. I've always been more lucky than knowledgeable about aquatic plants. They want to grow! I read recently, to add willow cuttings to the water because willow has a growth hormone that encourages root growth in other plants. You might want to give that a try. You might also want to take cuttings and make several small plants versus one big one. Some plants root better that way.

Best wishes!