Need a bit of advise here

I’m about 4 weeks into flower and one of my plans has started getting thes marks on the fan leaves next to the bud, all marks are in upper leaves what is this?
 
Can provide more photos iff needed
 

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they look like they need a good feed, what you feeding them on whats your ph temps RH water EC ?
when did you last give um cal/mag, growing media ?
 
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