maximusluminous
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100% BS... under HPS maybe but I never had red or purple stems under HPS, same strains under Intense LED's make stems red & purple depending on the strain. There is nothing any Cal, mag, nitrogen, P or K will do to fix it under led. I feed mine much more calcium under white LED's & I get the most red & purple stems, but its nothing to fret as the leaves tell the real story & there is no cal deficiency with my plants... but what is a magnesium/calcium deficiency is what I circled in this picBuddy look at ur stems. That a cal mag deficiency. Are u watering with RO or distilled water. If so u must add. Dark red purple stems r 100% signs of cal mag deficiency especially if ur plant look like it suffering. Hope this help. Just buy cal mag from ur local store