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+1 dosing a low tech tank is all about trial and error. Also remember that plants have a growth curve. Their nutrient uptake matches their growth. In time they will require more and more as their biomass increases.

I notice that you are not adding in any general trace blend other than Mg. Perhaps the plants are not consuming as much of the macros due to the limiting of some of these. Not enough to show deficiency but enough to slow them down.
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