Hi everyone, I'm back.
The soil step has been accomplished.
I have now a complete substrate composed of pouzzolane, flourite sachem red and scapesoil from oase. Everything in brown colors as suggested by one of you.  I think it fits great the tank.

Now, based on the suggestions given and plants available, I'm considering the following plants:

1. Carpeting with Hydrocotyle tripartitra (I can have 1x pot of in vitro for 3.78€. I will most likely buy a few ones and try to get a dense carpet from the start)

2. I will try to put moss everywhere on the wood. I have to, and you guys are expecting me to do so! 😂
I have my eyes on the Vesicularia dubyana Christmas. What do you think? It'll give a fern vibe, like back to Jurassic.

And then?
Could some littorella uniflora be added to that carpet? Or would it stand out to much? Maybe considering marsilea hirsute instead? It looks cuter and easier to blend in.
Then, I have in my basked Eleocharis Parvula, but I guess it'd stand out as much as the littorella uniflora, with the spikes, and maybe not fit the aesthetic of the hydrocotyle tripartita.

Thoughts?

Finally, had my eyes on Rotala rotundifolia Orange Juice and Lilnophila Hippuridoides for the nice colors and strange shapes, to accentuate the otherworldly vibe.
But it could maybe too much, and I should focus more on carpet and moss?

For the reminder, the plan is to go no filter. Just lights, plants, and maybe a little school of fish.
So, I wouldn't want that only carpet and moss end up being way too little for this kind of setup.

That's all for the part 2. Thanks for having read me.

[WIP] The otherworldly scape, pt.2