Browning / red spots

I use megacrop myself. If you’ve got shiny leaves I’d cut back on the ppm.
Most important. Get your ph in range. Your in soil so obviously the buffers ain’t working like they should or else you’d not have had the calmag issues. If calcium and magnesium is not available to the plant it will lock out other important elements. Ph in soil 6.0 to 6.5 so every element is available to the plant. Ph plain water and water until your runoff hits that level then start feeding again at half strength PhD bloom nutrients.
You will get to harvest.

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