Leaf deficiency

Hello growers.
today i discovered a leaf definition. Thay are all in Verk 4 veg under 600W MH. Leaf temp 24-25 celsius. 55-60 humietyi spray them with water ones or twos day during vegThe other ones are all doing fine. Same feeding on all of them. Any suggestion
Best RegardS
Nisskorv

Your plants look really healthy except for that one leaf, I think you're worrying to much and they are just fine.

Just for the hell of it check for bugs(you should be doing that periodically anyways)

Thanks for your replay