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Hi,
Recently read the Walstad book I found it helpful too and this was a key point of interest for me as well. My interpretation after a few readings was to deliver iron to the roots .With some caution though as iron toxicity in low ph substrate is of potential concern . Don't know if even high cec rated substrates take up the iron aggressively enough . I might try dosing moderately with full spectrum ferts ,plus bit of extra npk ( i'm running no fish currently ), a bit of trace and flourish tabs on fast growing iron hungry plants .If I get a good crop of fast growing iron hungry plants going probably switch back to just full spectrum fertilizer then .
 
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