Brown spots

its calcium lack i think. but could be wrong ph aftermath, when plant cant uptake calcium too, all plant looks very pale, i see stem purpuling too ..

Ya that looks like mid stage calcium deficiency. It's ok don't panic. Just start applying calmag regularly if in coco. In fact use cal mag with every feed and every watering. pH to 6.2 and your troubles are over.

I looked at the chart and it might be potassium or magnesium deficiency. Here's the link to the chart: https://loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg We're growing Purple Haze photos. They've been touchy. Good luck!

Calcium deficiency.

My guess would be either calcium deficiency or pests, such as mites or flies. It could be septoria, a type of fungus that causes leaf spot disease.