Really steep substrate slopes
I want to do an Iwagumi aquarium modeled after the flatirons in Boulder, CO. I'm specifically thinking of emulating the first three flatties. To do this, I'd need to have a very steep substrate with carpet plantings to model the tree-covered mountain-side. is it feasible to have such a steep substrate? How would I do it? To see what substrate grade I'm trying to attain search for photos of the flatirons.