tip of leaves curling upward

The canoeing of leaves if signs of heat stress to me. I would try and increase air flow in the tent and lower the mediums temp. The tent at 27c is hot but not so hot it would cause these issues. I've had lots of runs with 27-29c and it was ok. But one time my medium got to warm and it was an issues, I helped fix that by keeping it watered more regularly and increasing airflow. Best Of Luck!

Both your temp and your humidity are too high for her.... I'd knock the heat down to the mid-70s at least if you can and the humidity needs to get down into the 50s... DON'T transplant this lady... she's an auto and that kind of stress will stop her from developing on her own time schedule - you'll actually be preventing her from going into flower... She would have zero time to recover! Good luck!

This can also be a sign of magnesium deficiency.

Thanks guys, At one point I did gave her a whole liter with nutes and since then I wasn't able to dry completly the pot. There seem to be a spot that wont dry in center bottom even after 8 day of not watering. Should I transplant it in new soil or it's too late? I try to irrigate it close to the contour with 300ml at 2, 3 days interval to not over feed. For my next grow I'll maybe add perlite or try promix HP and be more gradual in watering.

Your temp are ok and the light distance is not too close. There is few reason leaves curl : - This plant was grown in muddy soil, and the curling, unhealthy leaves will be getting worse and worse over time and you might have root rot - Heat Stress If plants are experiencing a lot of heat, it can make leaves droop and/or curl. Some strains can handle a lot of heat, while other strains tend to droop when it gets warm Check the below website, I hope that helps 😊👊👍 https://www.growweedeasy.com/curling-or-clawing-cannabis-leaves Quick tip for LED lights - Check you light LUX. Get some LED lux meter app (free - Lux) • Clone and seedling stage: 5,000–7,000 lux • Vegetative stage: 15,000–50,000 lux • Flowering stage: 45,000–65,000 lux

Heat stress imo. Could be wind tho also.