I just cut these leaves off my girls. I have 4 plants that are ~10 weeks old now and have just flipped them to 12/12 a week ago.
Whatever the problem is is very isolated as these were all I could find among all 4 plants.
Time for some Captain Jack, is something else going on, or not to worry?
The plants are otherwise very healthy.
• What strain, GSC
• Method: Soil FFHF
• Vessels: Pots, 5 gal bucket
• PH of runoff: 6.3
• PPM/TDS Runoff is ~800
• Light system HLG Rspec 288s (1 per 2 plants)
• Temps; Day 79, Night 72
• Humidity; Day, Night ~60% constant
• Ventilation system; Yes 8" AC Infinity in a 5x5
• Co2; No