Dean4 zamnesia

Soil will never dry as fast as coco, wait until the top inch is completely dry before watering, and if you are using organic nutrients/living soil do not water until runoff, just until soil is saturated. Happy growing.

You have light stress. Light is too close plus it is probably too chilly. About 40 to 50 cm is flowering and 60 Is vegging. Good luck. Leaves won't repair themselves but can stop it from getting worse. Happy growing. 🌲🌲🌲👊

Temps do affect pH but it shouldn't be that much. Water at 7 pH will have a pH of 6.14 at boiling temperatures. I would take a small sample into a warmer area and retest the pH. Most meters compensate for temp as well, so if it gives you a temperature, it probably automatically compensates. Shake up your solution very well before taking a sample. Low temps could have caused some kind of separation within the solution.