Cupping?

Hello all, I just flushed with PH water due to a nutrient burn, and now i used half of the flower nute formula from GH was about to switch to flowering today, i noticed this happening to my plants last night does anyone know what it can be? and also will the leaves go back to normal or should i clip them? Thank You all so much!

Probably delayed injury from the burn. Let the plant drop its hurt leaves, unless they're blocking too much light.

~cannot resist~ is it happening to the 2 girls, or does just the 1 cup? cn

Haha, just one of them, Thank you so much for your response.

possibly a calcium deficiency i read about it somewhere in here. new to this but have been doing hours of research

Magnesium deficiency/calcium toxicity are your most likely culprits, and since they present somewhat similarly, calcium toxicity causing magnesium deficiency, you should avoid correcting with high calcium products like CalMag+ (faceplanted into this one recently); but, of course, make sure the problem isn't your pH before doing anything, otherwise you'll only make it worse.

After checking your pH to make sure that's not the problem, and checking to make sure you're not adding too much calcium (CalMag+ with GH Flora series, for example), refill your reservoir; and, a foliar will help things recover more quickly:

Reservoir: 2.5-5ml/Gal epsom salt
Foliar: 1.2-2.5ml/l epsom salt

id snip the leaves that were fried beyond fixin and hold off on the 12hour flip till new growth shows sings that the problem has fully passed

just my two brutha take it for whats its worth