It's a mobile diff ik that much I was thinking phos or cal mag an if so the right ph for the up take in soil it's a f1 hybrid titan rqs
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Soil temp 79 humidity 51Its not a magnesium def that causes whats called interveinial chlorosis. And i beleive a phos def juat yellows the serrated edges of the leaf at first. It looks like it could poaaibly bw thw atart of nitrogen def. But in flower that can be normal depending how far along you are. It looka tonme yoir about week 3-4 that would bw a littlw early for yellowing. Whats your temp and humidiy ? Are you growing soil?
Coco isnt soil. I just had an issue where i wasnt feeding enough or watering enough. They looked horrible was showing aigns of interveinial chlorosis. What someine suggested and it workwd out really well. Was to flush the coco with water phed to 5.8 withbat least 20% run off. After that feed with 1\2 strength nutrients and water every other day with nutrients go full strength after the first watering. Yours doesnt liik near as bad as mine were. It looks like a slight nitrogen def. Not sure why the ine leaf has brown spots if it was a mag def you would see it kn the leaves dark veins and inter leaf fading. Similar to the attached pic but more on the bottom of the plant.Ya soil coco an ocean 78 temp 51 humidity