How long have they been in those pots? Your soil chemistry just went screwy, evidenced by leaf issues and low runoff pH. I'm guessing they've been in those pots well over a month...?
Water VERY HEAVILY at 7.5 until the runoff comes up to almost 7, and then water again with 1/2 strength bloom food at pH 6.7 to finish the flush.
We see here the major drawback of SCROG... difficulty in accessing the pots nad re-potting if the need should arise.
stinkyattic Reviewed by stinkyattic on . One month to go, yellow leaves with brown spots i have a few plants, some of which are developing some yellow leaves and brown dead spots on them. they are growing in FFOF, using FF nutes, i worked my way up to full strength and they burned a little bit. i watered with only water 3 times after that, tap water ph is around 7.2 or a little higher, all i have now is a drop ph indicator. the runoff was at a ph of 6 ( or lower test only goes to 6 ). i gave them 1/2 strength nutes after these pics were taken. any input is appriciated! Rating: 5