Fan Leaves Yellowing, One Cola Looks Burned, Week 7 of Flower

I'm wondering if this is from nutrient burn? The ppm was increased slightly from 550 to 650 (baseline of well water is 200 ppm). I wouldn't think that wouldve had such a big effect. They have been happy around 500-550 ppm (currently at 500 ppm)...See photos below:



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In the pictures shown there is nothing wrong with the plants..one of the pictures looks like you cut almost every leaf of the plants.
What pictures has the nutrient burn ?

I think it was some bud rot. I cut it off and will continue to monitor.

Dont get me wrong but you know its normal for them to turn yellow beginning at the fan leaves when their life comes to an end? I mean which strain is that? and 7 Weeks in Bloom are almost done... you feel me?