Which deficiency is this?

Hey, guys,

In the flowering stage (in week 3 - 4) we confront with the same issue, let s say. I attached here a photo with some spots on the leaves. I read that this could be a potassium deficiency.
I have to mention that the girls are growing in clay pebbles & the Ph is 6.
Do you know what could cause this & how can it be solved?
 

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Hard to tell anything from one leaf.
Need a pic of the whole plant and all grow info you can give.
 
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