Ive been running coco this past run. My plants have had runnoff as high as 4500 ppm and ph as low as 4.7. No signs of lockout or def. I just kept adding the correct ph'd 900 ppm nutrients and tyey keep bulking in 3 gallon pots watered once every other day. Normally one would panic with those numbers. Do some drastic flush and fk up the whole grow. Just make sure there is runnoff.