I'm glad you got them to take the aluminum plant back.
The one you got in exchange is probably Vallisneria, which is a good choice: it's a fairly easy plant to grow.
Sunlight is OK in moderation, like having a tank against a wall where it gets a few hours of sun a day. As an experiment I tried putting a little tank directly in front of a window with no artificial lighting. It worked well in the winter, but with the increased sunlight of spring, it's covered in algae, so I'm about to move it away from the window and give it a fluoro tube. It might be possible to exactly balance the light entering with the needs of the plants so you don't get a mess of algae, but I didn't manage it!
I also feel that DIY CO2 is too much of a pain in the behind, so I don't do it. But you'll want to remove the bubble stone, if you ended up putting it in. It will drive off what little CO2 you actually have in the water, so it's not a good thing. As long as your fish are swimming normally, not gasping at the surface for air, you've got plenty enough oxygen in the water.
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