Yeah the height of the substrate helps a lot with depth. Wish I would made a bigger slope in my current 80 cm. But we learn every scape So far this is just potting soil for practice in my wooden box. My plan to make cheap high slope is using a lot of lava split. Which is permanent and cheaper than aqua soil. On top of that a little bit of soil on some places where I want plants in the ground. But most will be covered again with lava rocks and moss I think. On the path and in front la plata sand. Found a few stores with better prices (€15 / kg, normally it is 30 here) Couldn't resist to buy everything that looks like a tree. Yeah It cost a small fortune but I am happy with it. More hardscape is always better. Thanks Keith Well the next step will take some time. I want to enter contests with my current scapes and they are still a long time to go. For now it just practicing in the mock tank. When contests are over I will look all the hardscapes that I created and build the one that I like the most.