Leaves curling upward at the edges and looking dry on the side facing the fan are wind burn, not a deficiency, and it is common in small CBD tents where the fan has nowhere else to point. The fix is aiming the airflow above or below the canopy so the leaves rustle rather than thrash. Photos of wind damage against heat stress and light stress, which all curl differently, are on [url]https://calmcbdseeds.com[/url] and they clear up a lot of confusion. Gentle constant movement is the goal, not a gale.