Check your runoff EC. If it's higher than your ~1.2-1.5EC feed you're probably in a lock out situation. There are other well more experienced people than me to suggest what's going on, but your plant does look hungry and I'd think there's some Magnesium issue as well.I water with RO and feed once a week 600-700 ppm with ph of 6.3-6.5. I haven’t checked the ph of my run off yet but I do add some cal Mag every other feed.
If that's soiless then you should be 5.6 to 5.8 veg and 5.8 to 6 in flower. I go my last week at like 6.3 before harvest in hydroCheck your runoff EC. If it's higher than your ~1.2-1.5EC feed you're probably in a lock out situation. There are other well more experienced people than me to suggest what's going on, but your plant does look hungry and I'd think there's some Magnesium issue as well.
When I moved to promix it was suggested that I bring my pH down lower to 5.8-6.2 zone as it's technically a 'soilless medium' and that's worked for me pretty well.