Leaf curl

[Cannapiss]

My leaves have started to shade themselves ...niw i know they do this because of light but does heat do it aswell...my plants are in a 80×80x160cm tent..i have an exhaust fan out the top and 2 small fans inside and keep one side vent open.....im using a 400wt hps and it is like nearly 2 ft away from the top of plant(i keep another flowering plant in there for 12 hours a day and have the light height adjusted for that...so yeah 2 ft above and still getting leaf curl

 

[Green thumb lou]

Good morning. This is some good advice from a knowledgeable grower. Taco leaves and mid range temps