Robertsanswered grow question 8 months ago If you are growing in coco and run off is reading 6.3, that is lock out for a coco grow. Like on the line. Flowering npk ratio is 1-2-3. Of I remember right you are doing coco. I would flush it till the ph comes down in you run off reading. Then re apply fresh feed to refresh your coco from the flush. 6.1 to 6.2 is ideal for potassium, and phosphorus absorption in flowering stage.