Hi - yes, I’ve been in coco for years, but never seen anything like this. It’s odd as 2/3 of the room is my old strains which have no signs of this discolouration after nearly 6 weeks side by side with this new strain..
I’ve never grown in strait coco , to me it looks PH related try going onto a cannabis deficiency page and see what you come up with there’s many good sites do some study , how is your drainage in strait coco .?
Drainage & PH is fine. That’s the weird thing, I’ve been growing for 20ish years & these days never have a PH or nutrient problem - or any other problems to be honest. A fairly consistent 36-45 ounces a plant, no deficiencies right to the end. This is what’s puzzling me as I’ve never seen this kind of thing..