Sphagnum peat moss used to be the preferred substrate of choice way back when and has the highest CEC of anything that I know of. I do agree the easiest way would be to mix sphagnum peat moss (lowers pH), potash (for potassium), and Iron Chelate 10% (Fe) together in a bucket and then put a light dusting on the bottom glass before you add the substrate.
That will last a month or two and help speed up your plant growth uptake and your substrates ability to absorb nutrients.
But I'm starting the tank with plants I won't want after cycling and I'll be getting hardscape materials later down the road..So I'm pretty sure I'd end up breaking the cap layer - this would be an issue, right?
That's OK, the point to the non-fert soil is a safety net, if you break the cap the most that will happen is you get a bit of dirt in your water column for a few hours but if you use fertilized soil you'll get that and an algae bloom.
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