Leaf Curling Up Problem

[Old_School]

Can anyone tell me what causes fan leaves to curl up like this?

[Myfriendis410]

LIkely light stress. Heat can cause ‘taco’ leaves as well but a good indicator for light stress is it appears on topmost leaves and not understory.

[Old_School]

I just raised my LED light to lower the light to 500, it was at 600 and 16 hours where I think I was at 17.

[yoshi]

18 - to 24 inches shoukd be the sweet spot ? Plus your humidity is low , foliar spray them once a week !