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Coco 50%, Perlite 50%, 23w CFL light bulb, 4 inches above the plant. Watering every 3-4 days. Very light fertilizer, ppm about 150-200

Please see attached pictures. The light is 2x23w CFL 18/6 (growing indoors, but that goes without saying I think :) ). There are two in coco/perlite (50/50) and one is in soil (growing well). But the two in coco has begun to turn yellow and doesn't grow. Underfed, overfed, salt built up or...