It started with yellowing between the veins and I thought it's Mag deficiency, already ordered Epsom Salt. Today many leaves started dying. Is it just Mag def. or something else? Shouldn't be over watering.
Hello Korn420lie,
Yes this is a Mag deficiency. Probably due pH out of range. Because a young plant like that is not really using a lot of Cal-Mag it is more important during pre-flowering and late flowering.
Happy Growing Buddy! 💚
Looks like a ph imbalance and there may be a few Nutrients not available to it. Diary says your in soil so aim for a input ph 6.2 and check how far out your runoff ph is.