Zkittles Auto deficiency maybe?

Noticed this on the bottom leaves, always add the right amount of calmag in my mixes, what could it be? It is only on a few bottom leaves nothing crazy Top leaves do not have it

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Old fans the plant is consuming and will yellow and drop in the next couple of weeks. As long as it’s random fan leaves down low that is normal.

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I was thinking that was it but wanted to be certain