Nutritions

Hey friend. You need to up your ph to 6.3 increase your feed to 700 ppm 1.4 ec and you need to check your runoff ph and ec levels before you do anything. If your runoff ph is low you need to sprinkle a little lime and water in. If your growing in cocoa and ph is dropping it likely wasn't buffered properly. Dont go to high on your nutes I always start at 1.2 and usually max out at 1.7 ec in mid flower and back to 1.2 in late flower. Cheers friend

This is kind of odd. If you're in a hydro setup, your best bet is going to be a reservoir change and a slight increase in nutes. It could be too much CO2 as well. If you're using a CO2 injection system of some kind, get your air pumps away from it, even if you have to put the pumps outside of your grow space and snake the tubing in. Roots need air, they arent big fans of CO2.

If you're not watering enough to have run off, then you're leaving nutes on the soil, they accumulate when dry as salts and then once you add more water the next feed they dilute and will f-up your plants. I would do a flush and resume feeding, remember to always have runoff because roots can get too dry and they do not like this either. Keep on the great care! Happy smokes!