Plants curling

If the leaves are drooping it’s a over watering or under watering problem
I do not think it’s a watering issue these girls all get the same amount of water and allow for a proper dryback but it seems to be only affecting a particular strain. That is why I’m leaning toward N toxicity the leaf is super dark and shiny !
 
Everytime i got curling leaves that are still lush green but wrinkled or even leathery usually over fed it nitrogen. I usually run just reg ph water for awile that usually helps unless its showing signs of starvation
 
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