Is it possible that it’s solely or possibly mostly a light issue and not a deficiency? It’s the worst on the tallest plant, which is therefore receiving the least amount of light at the depth of the yellowing.
Also last night I gave them their first only bloom nutes at a slightly higher ppm than ever other feeding they’ve gotten, though still only 615ppm. A touch of silica as well. Noticed a fair number of tiny little yellow spots that have developed.
I was planning on putting a 6” oscillating fan underneath the canopy but the pots and plants are too big. There’s really no room.
I’m thinking airflow under there is pretty important yeah? Since I can’t get any fans under there, I’m kinda thinking I should pretty heavily defoliate and of course lollipop. That way, the breeze from the two above canopy oscillators will have a better chance of moving some air down below.
Seems necessary to remove most of the large fan leaves to make that happen?