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Been experiencing exactly the same with my last batch of FF premium. Magnesium deficiency/overfed look. I thought i overfed, but after taking some clones and sticking them in more of the same batch... Been 6 weeks, i havent fed once and they are looking borderline overfed. I think this was just a hot batch of soil. My grows have been consistent for the last 5 years. In fact i have been reusing my old soil, just reamending with elemental blend. Nothing has changed, except for the new soil i bought.