Indoor Nute burn or lack of N?

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Blue mystic
Hi my strain blue mystic auto is 42 days from seeds. I notice some of the older fan leaves turning yellow and crispy. I do some reading there were some who say it normal, other articles says lack of N. So i was looking for some advice guys. Thanks
 

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Looks like lack of N, if it was nute burn it would be burned on the tips

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Then again it looks like it needs magneisium

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Nitrogen can hit earlier and does quite often. Pretty standard stuff for lower leaves. I don't see any nute burn. Besides the standard leaf tips that would normally exhibits burn, it can travel up the sides of a leaf, but not often.
 
Thanks guys for your reply :)
 
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