White Widow yellow spots

so my plants are about 45 days old and I've just noticed a slight malady. here you'll notice some, only very slight, yellowing between the veins.
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and here you notice some damage that looks like it was desiccated in spots, I looked for bugs but could find none
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I haven't been adding nutes because the last time I did the leaves began to claw but I'm wondering if its time to add some now.

check the pH, the bottoms of the leaves, and the holes on your pot for gnats of some sort. it could just be aphids, kind of early to tell but the first ones lookin like cal/mag