If its 20 degree and an ec of 0.85 everything is alright, upcurling leaves can be anything... a root problem etc.. heat or lightstress looks different , all leaves are cupping then. And a nitogen excess shows up in darkgreen leaves and burnt tips.......happy growing
https://www.growweedeasy.com/search-results?keyword=dwc.... for further questions just ask or look here
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