This Jack Herer is 2 weeks into flower and is just started showing this "deficiency". It's mainly near the top so am suspecting light burn since lowering the LED light for flowering but the pics don't quite match up with what I see here and elsewhere online.
It also looks a little like a PH issue but run-off has been consistently around 6.5. 1150ppm last feeding, 5 days ago.
Any suggestions? THX!