Not sure what this is, i am leaning towards heat stress but i need help to ID it.
whats your pH and ec? also what nutrients are you using?
What's ur temps again? How much u feeding? are you checkin pH? Not alot of info for anyone to try and help
failure is the mother of success"
Looks like your ph is out of whack.
Adjust to range 5.5-6.5
ph 5.5 @ 1100PPM via GH Flora series. temps in tent i am unsure of, my wireless moniter fell to the base of the plants, but one day i recall it reading 84, so at the tops of the plants it could of been 95+. This only affects the top portion of the plants, and some leaves have curled up (like a taco). i added some water to bring the PPM's down, since the PH goes down and the PPMs go up over time. which may indicate too strong a feeding, or the plants could be just taking so much water per day that the solution gets concentrated via evaporation/plant usage.