I ordered a similar pack and had one hell of a time getting them to sprout and grow. Lost a LOT after sprouting.
The "carpet" plant seeds I got ended up being Hygrophila polysperma (and subtypes), which are decidedly NOT carpet plants.
My suggestion is to not fully submerse these seeds once they sprout. I put mine in terra cotta pot drip trays/saucers with a shrimp/plant pearl substrate. Kept it wet, with the saucer also in the tank water on a shelf so it stayed warm and was under BRIGHT light. Everything sprouted eventually (4 days to 21 days), but I lost all of it when I submersed it for further growth.
You're way better off having your LFS order the specific plants you're looking for. Way faster return on your investment, with more certain results about what you're getting.
That small-leafed dark dark red plant is Ludwigia "Rubin." Not hard to grow at all. The brighter the light, the darker it gets. Under dim light, it'll go green to orange-green.
All that being said, growing from seeds is fun. And you get some extra points with your local club as a grower when you do it that way.
-DTWGulo