I agree, after using Fox Farm soil I've started to add a bit of Dolomite Lime to the mix.Fox Farm line lacks cal mag. You'll need to supplement that in
check below the leaves for webbing or mites. The second picture looks to me like spider mites.Can you get a closer picture? Do you have a jewelers loupe?
How many plants do you have and how many are affected?
I see pitting when I zoom in in the leaves. I also notice circular spots. Could be a deficiency, but I think you may have some sort of mites.