Gravel as base for finer substrate?
I have a 90 gallon which will have plants and corydoras.
Today it has an inch of gravel 3-5mm.
To get the desired slope to create depth, does it work to use the gravel as a base and top it with a layer of base soil and a layer of fine sand or will it all sink down into the gravel?
What is the correct way to do it?