Help! plant looks like its dying. Phosphorus, Calcium or Magnesium deficiency???

this is indoor

watering twice a day at 5.8-5.9 PH level

rockwool

about 3rd week into flowering


this is happening to about 40% of my plant


should i add some calmag ??

Seems odd for this to suddenly happen. Perhaps your plant's growth rate is increasing and your nute levels need to be upped. I know with rockwool there is no nute retention like with soil so maybe trying increasing your feed concentration?

Hope you can bring this baby back, shitty time for problems to arise!

my ppm is 1600
should i lower nutes feeding?

nute burn definately