Substrate Support (~12")
I want to build up a REALLY dramatic cliff/valley. So I need to bank up my substrate to about 12" off the bottom. Obviously it's a bad idea to have that deep of a substrate on its own.
What do you guys recommend to use to "pre-build" a deep base before layering with substrate?
I've read somewhere of cutting egg crates to various sizes than stacking them. But then what? Do I put a fine mesh over it? Wouldn't the water trapped under the mesh get really stale? would that even matter?