BudXsanswered grow question 5 years ago They got a bit too much nitrogen (dark green) and looks like the ph may be off a bit (copper edges on lower leaves) I would do a clean of your res, recalibrate your ph tester, especially if a cheap chinese made one, and run plain water for a day. Go back with 3/4 recommended dose and gradually adjust up your EC. If you seen either of these symptoms re-occur, flush and clean, calibrate and adjust