Hi Nazasaki,
It is not necessary to use dirt in a planted tank, nor is it necessary to use layers. All of my tanks use just one substrate - it is easier to clean and re-use that way.
Roy_________
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75 Gallon, 2X55W AH Supply CF 8800K, 1XFluval F&P 2.0; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 and (Calcined) Montmorillonite Clay