What deficiency is this?

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Hey guys! I'm growing in coco/perlite. Room temp is around 26 and RH 70 . Day 38. She seems too small and has some yellowing. What is it ?
 

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Hey guys! I'm growing in coco/perlite. Room temp is around 26 and RH 70 . Day 38. She seems too small and has some yellowing. What is it ?
what feed are you using with her and what ppm or ec
 
That's the start of a potassium issue.
 
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