Please help me identify these plants and give advice.

[entropy]

Hi Everyone,
Newbie here. Can someone help me identify some plants I got from lfs today. They were floating in the tanks. The owner gave me these for free. He did not know what they are. I am guessing one is java moss, although some clumps seem a little darker, I suspect this is due to algae. Can anyone confirm what these are and why some clumps appear darker?
Clump #1 - Lighter in color
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Clump #2 - Darker in color
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Clump #2 - Different angle
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The second batch is some type of hairy grass which appears to have some small little roots.
Grassy Clump
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Grassy Clump separated
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They were mixed together so I had to pick out some of the fine grass like plant out of what appears to be a moss. I don't think these two would look good together but they were free. Any help or opinions would be appreciated. I was planning on getting a few Java plants and starting a moss tank with Neon Tetras or Cardinal Tetras. Thanks in advance.

[maryab91]

Java Moss and Hair Grass!

[petluvr]

Hard to tell on the last without it being in water, could be hornwort.

[maryab91]

I think it's hair grass, just in a huge overgrown clump.

[entropy]

Thank you for your replies. I think it is hair grass too. It feels just like hair! I researched it and it appears to be an over grown clump. I attempted to separate it and align the roots, then planted a little bunch in the gravel. What a pain that was! I left the rest free floating and plan to continue bunching it later. I hope it does not spread erratically throughout the tank by free floating. I have some left over plant pots from previous plants. If I wanted to use a pot, does anyone have any suggestions on what media to use? I guess I could use gravel but I figured it would not hold well and this is a new tank with not fish yet, so little nutrients. Actually, I take that back, there was a little fry of some sort hiding in the grass. So that was an added surprise. I am curious to see what it grows into if it survives; I don't think I am fully cycled yet.

[schaadrak]

I think the last one is guppy grass or Naja grass. It's mostly used as a floating plant but you can plant it, too. I would use sand, but I'm not sure if they need rooot tabs if they're planted in the substrate.