Substrate help please?

Question

could i put dark gravel in the bottom

and then use this on top of the gravel

http://www.aquamoss.net/How%20to%20create%20a%20moss%20wall/How%20to%20create%20a%20moss%20wall.htm

instead of as a backdrop

then cut holes in the moss wall and plant plants in the gravel through the wall

Answer 1

Instead of doing that for the whole tank and then cutting holes for other plants, why not just use it for a portion of the tank, like a front corner extending into the back, or a "path" of moss up the middle, with the path getting smaller as it winds towards the back of the tank?  A bit artsy, but it'd look cool, and wouldn't give the impression of a moss-dominated tank.

Answer 2

That's pretty amazing, good luck :)