Help! 7 weeks into veg in living soil and I started seeing these spots on my leaves

I defoliated the sick looking leaves off the plant and noticed the spots are more pronounced in older leaves. They start as white spots along the edges and slowly turn yellow and it almost looks as if the spots eventually eat away at the leaf. Any ideas on what this might be, I thought a calcium deficiency but I am unsure.
 

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What size pots are they in they look small. How often do top dress did you top dress before you flipped to flower with your flower nutes or top dress after you flipped the reason I ask is it takes a minute for dry nutes to be available for the plant example is I top dress a few weeks before I flower so that those nutes are available when I flower
 
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