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Thanks, I will try and use some cal-mag and silica and go without feeding them for a week. The light is about 12 inches above the canopy. They get about half the nutrient suggested on the product. Can I spray with the Silica even while they are flowering? The soil temp probably does drop...

Hello all, I am hoping someone may please kindly lend their expertise and advise if this is a potassium deficiency and if not what it may be? I'm using debco premium potting mix and Debco pot mate potting mix. Next time around I will be using coco coir. They're under a 600wHPS, there is a...