Certain hygro stem plants work well for this.
Carpet plants no co2.
Anything that would grow like you are describing needs high light lots of fertilizer and co2.
Some of the hygro require co2 and lots of light.
But like i said a bunch of light without co2 isn t a good formula to experiment with.
It tends to turn out poorly for most people.
While others will grow anywhere just about with no co2.
Carpet plants also offer an alternative to floating or vertically growing plants in their aquarium.
Hairgrass would probably struggle to stay alive and i know you could not get a carpet from it in inert substrate and no co2.
I would get the hang of low light plants before getting into carpeting plants.
So first of all forget about fishes at least till the plants are flourished and a decent carpet is achieved.
Many of the more attractive species of carpeting plants grow better with more light.
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.
Negative aspects of selecting non co2 plants non co2 plants feature a slow growth rate and people who want a rapid growing plant in their aquarium will surely be disappointed and should look into setting up a co2 planted tank if they already haven t.
You need to remember the goal is to achieve carpet in a low tech no co2 planted tank.
Tips for better success rate with low tech carpet.
For fish tank owners who regularly replace their aquatic plants they might not find this approach useful.
Additionally your aquarium lighting will affect every plant differently with some plants thriving in low light situations better than others.
Just check they are low to medium light and low tech.
Best easy carpeting aquascaping plants without co2 number two on the list which i also have in here as you can see this plant can be super invasive and it s just like the s repens with the light if you give it low light it will grow as tall as it wants to so just be careful because this plant can be very invasive i m constantly picking out.
There are certain species you could try dwarf sags dwarf hairgrass marsilia certain hydrocotyle spp etc.
Can act as carpet plants and aren t very picky.
You need to wait before a balance is existing in your closed eco system.