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Coco grow with fox farms nutes and cal mag. Two weeks into flower these spots showed up. Wondering if the tiger bloom ( newest addition / only change) is creating a calcium deficiency. What's it look like to you guys?

I'm doing a cocoa grow and a 3X3. There are four plants in 7 gallon fabric pots. I have a 4-in exhaust fan that I just took the carbon filter off of (25% CFM). Before that adjustment even running 2D humidifiers I can't get the RH under 60%. I should only need 144ish CFM and I've got 148.5...

Comments?

These were planted on wed and it's sat. All they've had is pH 5.8 distilled water (ppm 0) The nute chart says feed. My buddy says they'll burn if the roots don't establish first. I've heard it both ways about ppm 240-400 is safe if they have their first true leaves they're photosynthesizing...