Dimples and curling in leaves

From what I read can be ph or humidity problem just lookin for suggestions on what to do. Dimples and leaves appear to be curling. Using water ph of 6.0 and still in veg. Has gotten a little worse over last few weeks.
 

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Heat stress and/or root rot.

Check/fix grow room temps, ensure not overwatering, check aeration/airstone for hydro.
 
They are trying to sweat !! They are too wet ! The lights too close ? Does it get above 80 ? They are trying to loose water, if they are trying to retain it they will cup down to try to hold it in.
 
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