I just got a new 4'x2'x2' tank. I need some feedbacks with regard to substrate setup as I have limited experience on the setting up a 120gal tank.Currently just thought of setting a layer of Azoo Basic Subtrate Fert and top up with 2-3" of 2mm gravel. I have no idea how to setup layers of substrate with mixture of different fert.My tank will consists mostly small to medium plants.Any tips and guidelines for a good setup??
Anyone tried using fert sourced from nursery or other cost effective alternative??

Really appreciate your comments and many thanks in advance.