I am having a little issue with some of the fan leaves curling. From the early weeks of grow (4 weeks already) some fan leaves have curled on the sides, plus a claw (see picks). First, I thought it was the wind burn from the fan blowing directly on the plants. After moving the fan, the problem continues. Next thought was nitrogen toxicity or overwatering. Flushed the medium, let it go dry, rewatered. Still some leaves want to shrivel up for some reason. Any knowledge sharing would be appreciated 
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Damaged leaves won’t heal, just continue to watch for others that start to claw and not the ones that have already done so before the flush.
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