substrate question - ADA substrates
hi i am thinking about setting up a 90 gallon tank - 36x24x24 and am leaning towards a darker look with a minimalistic feel to it.
the way i have it in my mind is to not have the whole tank be overgrown with plants but to have crypts for the most part and different anubias. having said that, i am thinking about getting these types of substrate: aqua soil malaysia (9 liters) and forest sand (orinoco) 3x 8kg bags for a total of 24 kg of sand from ADA (aqua design amano).
i am wondering if layering down the aqua soil as the base and covering that up with the forest sand is the way to lay down the substrate in this case? am i using the substrate correctly? is this the way it was meant to complement each other? i'd like to end up with around 2" in the front and side edges of the tank and around 3-3.5" towards the middle and back of the tank.
thanks in advance.