Look bottom right last picture. Looks like a stem plant to me. Some kind of hygrophila? For identification you need to take one out post a picture of the entire plant with roots.
At any rate it was a good buy, looks good and doing well.
Taking a whole plant out for a better ID will be key
.. and a link to the seeds you found too.
In my experience most seeds sold as Aquatic plants tend to be a non aquatic grass, it's far too expensive and involved to propagate aquatics through seed. Especially when they will multiply other ways.
They normally die off after a few weeks of looking good.. I would be interested in an update of how they are doing.
Planted tanks are a mainstream and quickly developing section of the aquarium diversion, one that permits specialists to consolidate the magnificence of nature with the advantages of a fair environment. In contrast to a conventional aquarium, live plants are the essential center, with fish being an emphasize or praise to the general impact.
Advantages of a Live Plants in an Aquarium:
Upgrade water quality and help forestall green growth development by utilizing supplements delivered by fish squander, uneaten food and natural flotsam and jetsam
Produce oxygen during sunlight hours, which is utilized by fish and settles pH, thusly, fish discharge CO₂, which plants use as a food source
Fish will in general have a sense of security which urges them to remain out in the open and grow progressively distinctive hues
Support numerous sorts of fish to bring forth and give recently incubated fry a spot to cover up while they develop
Arranging a Planted Aquarium:
Planted tanks are less work to keep up than regular aquariums, yet they require appropriate arranging. Uncommon consideration ought to be paid to tank measurements, lighting, substrate, composts and decision of plant and fish species. A very much arranged and kept up planted aquarium will give long stretches of pleasure and unwinding. How about we begin!
Choosing an Aquarium for Live Plants:
Think about the sorts of plants – and fish – you need to keep and afterward pick an aquarium that best suits their necessities. Practically any measured aquarium can be utilized to set up a planted tank, anyway taller tanks require more grounded lighting for certain plant species. Aqueon offers a wide scope of aquarium sizes reasonable for planted showcases.