Aquasoil and gravel?
Hey I've been stalking around on the forum for a while and decided that I'd begin my first planted tank 20 gallon! Since it's my first time on here and doing a planted tank, I wanted to know if a 9lt bag of Aquasoil would be enough to cover the front and add some depth(3 inches maybe?) in the back. If not, would I be able to add some gravel in the back for extra height? Thanks!