Is this iron deficiency? Stress? Nutrient burn?
Soil is half promix hp and half .7 .7 .7 soil (and a bit of sheep manure) and a hand full of perlite + vermiculite.
Soil ph is 6 to 6.5, NPK values shown in the pic (not run off water ph)
i fed them .20.20.20 plant food August 8th because they were low on everything.
i did half lollipop them August 24th, watered once over the week, rained twice so didn't need to water.
Only newer leaves are turning yellow from the inside out, the rest of the leaves are nice and green.