Interveinal Chlorosis Day 35 Flower

Any ideas? Starting from the tips inward, at all levels of the plant from top to bottom, about 1 in every 5 fan leaves is doing this. Day 35 flower.

85F/60% Lights ON
78F/60% Lights OFF
900-1100ppm CO2 Lights ON

1.6EC 6.0pH

Botanicare CNS Bloom
Dynagro Protekt
H&G Drip Clean
H&G Roots Excel


I'm not super worried as they are filling up nicely, just curious as to what this is.

Just nute burn maybe? Feeding 800ppm into coco, runoff is 850ppm, doesn't seem too high, but who knows!

Yes, the plants are starving if they are in soil/soiless. If hydro then someone else might be more help.