Im in a timed 12/12 Schedule right now, in the 2nd week of flower. Im growing in 100% Botanicaire Coco..... Im in a sealed Room... I use Co2 (with a meter). I have AC and the room stays at 74 Degrees at all times, with 40-50% Humidity. Im using Soul Synthetic Nutes.... Im mixing my feed to a PPM of 800-900, and a PH of 5.8., I just went outside and measured the runoff waste water and it was the same ppms, and the PH was 6.5 (higher). I have been flushing with water only once per week (per recommendation of the local grow store). Is it a Nitrogen Deficiency? This is what I originally thought..... But it doesnt seem to be... Also, I was told that with Coco, you never measure the runoff water PH or PPM... Is this true? Thanks guys for the responses!!!