What type of medium; coco What brand and type of soil? biobizz coco Indoors or outdoors? indoors What strain? NL auto(gsh) How old are the plants? 3 and a half weeks into flower What type of lights and how many watts? CFL about 150w How far from the lights? 1inch What is your watering frequency and source of water? Tap water, 3-4 days What, how much and when was it fed? NPK? 2 days ago with Hesi coco What is the medium/runoff pH and PPM if in hydro?medium 6.3 runoff 6.0, ppm-750-800 What size pots? 3 I have 2 of NL growing right now and other is just fine, something changed in the last week, but I can't tell, because I treat them equally and other one looks just fine right now..
Simply drop the ph of your root-zone to 5.8 for a bit of improvement, especially in flower. Plants will slip in nutrient uptake of Ca, Mn, and Boron, but most revealing, plants in Coco with a substrate ph of 6.3 (if this is indeed correct) would be locking out P, K and Zn. So, if you just discovered this, I'd lower the ph as soon as possible as several of these deficits are already expressing. Add Cal/Mag also.