Those curl up dried out leaves are related to how you are watering or the humidity of your grow area if you. it's possible to water to little with every watering and your roots die back after a couple days.
Do you water to run off? Give us some details on your watering schedule and the quantity and your humidity.
The deficiency is very minor and not an issue at this point, I would focus on getting your environment totally dialed in to where you don't see anymore those curly cue dried out leaves.
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