Any ideas why my lower leaves are wilting a bit ?? 2nd week 12/12

I got AK48 an Northern lights mamas flowering by puting em a big ice chest under my house for 12hr each day. My grow box is full of clones an need 16 hrs light.

Iam seeing some lower leaves droooping an lost a few. Nothing is bad yet , but dont want it to suprize me.

I thought it was over watering so i cut water off tell they got pretty dry, now they get half rations water. They feel dry but they still look about the same?

The ice chest seals up kinda good could if be the air quality cause there aint no ventalation in there. Would a co2 soda bottle set up help this. The temps are cool?
The Humidity is pretty high after 12 hrs

Any ideas??

help?

A

I'm on my second week of flowering and mine mine are doing the same thing. I'm not sure if the humidity is too high but I know its not overwatering...

When plants are flowering they use more nitrogen for the flowers and less for the leaves. its natural for bottom leaves to start to wilt and become a light yellow-green as the nitrogen is leached more and more from the lower leaves and transferred to the flowers.