Certain hygro stem plants work well for this.
Carpet plants no co2.
It tends to turn out poorly for most people.
There are certain species you could try dwarf sags dwarf hairgrass marsilia certain hydrocotyle spp etc.
To use a non carpet plant as a carpet you need to be able to keep it trimmed short.
Just check they are low to medium light and low tech.
Many of the more attractive species of carpeting plants grow better with more light.
I would get the hang of low light plants before getting into carpeting plants.
You need to remember the goal is to achieve carpet in a low tech no co2 planted tank.
While others will grow anywhere just about with no co2.
In nature many aquatic plant species grow in co2 rich environments but here we want a low tech setup that does not use co2 injection to replicate such a condition.
Some of the hygro require co2 and lots of light.
Picking out the right carpet plant for your aquarium is certainly tough especially when trying to select the right plants for beginners.
Tips for better success rate with low tech carpet.
Carpet plants also offer an alternative to floating or vertically growing plants in their aquarium.
Can act as carpet plants and aren t very picky.
For fish tank owners who regularly replace their aquatic plants they might not find this approach useful.
So first of all forget about fishes at least till the plants are flourished and a decent carpet is achieved.
You need to wait before a balance is existing in your closed eco system.
But like i said a bunch of light without co2 isn t a good formula to experiment with.
Hairgrass would probably struggle to stay alive and i know you could not get a carpet from it in inert substrate and no co2.
Anything that would grow like you are describing needs high light lots of fertilizer and co2.
Acclimation the most difficult stage of growing a carpet is at the start.