Need help don't know what this is on my plant

That is much too little info for a diagnosis.

Different nutrient issues show up at different points on the plant. Mobile nutrients will show up in older leaves first and vice versa.

Impossible to say though. My leg hurts. Can someone tell me why?
 
Are you using tap water? RO/Distilled? Could be cal/mag def if not using tap water. I get similar things in coco if not using enough calmag.
 
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