Dosing in a soil substrate tank....
OK... here is my first question. A little back ground.
I have a 30 gallon aquarium with what I call a layered soil substrate. Sub layer is 1" of this mix:
7 parts clean topsoil
1 part peat moss
1 part calcified clay (Turface)
1 part red flint gravel
That is capped with 1" of s#30 red flint gravel.
The tank is primarily planted with root feeders: Echinodoras, Cryptocoryne and Aponogeton. There is a bit of Rotala indica and a good growth of Valisnaria grass as well.
Light is two 36" HOT5 bulbs... one 10,000K (this is a photo tank and I need the spectrum) and one 6500K. No CO2 supplementation. Plants are doing very well, though I would like to see the Echinodoras increase their height. (kleiner bar and Amazon swords). Right now that are staying at about 9" tall.
Question: Should the dosing of nutrients be different for a soil tank, considering the nutrient-rich substrate that the roots of the plants are in?