I have a bunch of mesh bags and I plan to raise the back end of my scape a lot, eventually. I had this idea to use a coule skinny slabs of slate, oriented vertically on the long edge, to build tiers that keep the top layer of substrate from eroding at higher altitudes.There's going to be a lot of mesh bags of lava rock holding the final height. This one's going to be tricky, for sure... I don't think I've ever gone this high with my substrate before.
