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Your leaf damage appears to be from a magnesium deficiency possibly from the pH imbalance or the recent flush period.
You want pH 5.8 for hydroponic and soiless (peat moss and coco coir) and pH 6.5 for soil.
Here is a nutrient availability chart
Here is a cannabis leaf deficiency chart
here is the Cannabis Plant and Pest Problem Solver and the Plant Abuse Chart
Cannabis Plant and Pest Problem Solver: Pictorial
Plant Abuse Chart
don't stress. feed once with a full range fertilizer then relax.
Ok, I'll try to get King John over here. He's great with identifying deficiencies.
Ohhh, lots of goodies.
Sounds like everything is coming together. Good job 84! How is plant #1 doing?
they look great. I wonder if each one of those branches is going to turn into a fat cola?
I believe that perlite and vermiculite should be added to every good soil/soiless mixture. Perlite adds aeration and vermiculite adds water retention and acts as a catalyst between roots and nutrients. Perlite and vermiculite will not change the pH of your soil/ soiless mixture. I would still use peat moss to reduce the pH of your soil to an acceptable pH 6.5.
Make sure you discontinue calcium and magnesium supplementation 2 weeks prior to harvest in order to give the plant time to use its nutrient stores during the flush period.