I would not use dirt or soil. I have used peat/kitty litter under 1-2mm gravel in a low tech 10 gal tank that grows plants remarkably well when compared to the other 10gal tanks I have with just gravel or onyx sand.
I don't think I would use peat in a co2 injected hi-tech tank for fear of too much organic matter in the substrate and creating potential algae issues with the higher light outputs.
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FILSTAR Pimp #2
75 gal heavily planted,50/50 Black beauty,Eco-complete substrate, Pressurised CO2 with solenoid, ph controller, AB Reactor 1000, 330 watts 9325K GE PC lighting,Ehiem Liquidoser, 2-Filstar xp3 canisters.
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