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I agree with cali if it was N toxicity they would get really dark and could claw if bad enough. I think it’s just the new plant parts eating the older parts and will be fine once the roots stretch out into the new soil. This is my guess without having all the info cali is asking for to give you a proper diagnosis
’ Nitrogen toxicity will make your leaves super dark green… I really think it’s magnesium deficiency. Try adding about 1/8 teaspoon of. Epsom salt per gallon of water an and fill out the support ticket so we can better help