End of Cicle or High stress???

Turgor pressure linked to transpiration, but there is no transpiration, droopy, tells me water flow has ceased. Leafs closest to light used up the chlorophyll but is unable to uptake or process fresh chlorophyll through Rubisco regeneration, nongas exchange. Burnt tips tells us EC is high in the medium causing osmotic stress. If water is just sitting in the pot it will prevent iron from forming into usable forms, iron fuxked you can't process new nitrogen, no nitrogen to spare, the microorganisms can no longer convert sugars into ATP. No atp no bulk flow, no nothing. Switch that pot with pot closest to air intake. First id check soil temp, if over 74F thats your problem most likely. Maintaining airflow between 0.2m/s and 0.4m/s is critical also for even air distribution especially at night, if air is pulled in from one side the opposite side will have reduced access to the critical resource of fresh air. Oxygen. Often overlooked, but oxygen consists of 43% of a plants mass dry matter after all water is removed. Do not disregard oxy, NPK and all the rest consists of 3-5% of a plants dry matter. 🙄 If your using organic delivery of nutrients the oxygen demand increases sharply due to having to provide enough oxygen to feed the rhizosphere as well. Inevitably a purely synthetic grow the oxygen requirements are much lower. This is never something explained to any new growers. But something I have noticed is a substantial difference. May be a simple solution. Good luck anyhow.