Sorry, closed too quickly, maybe a second opinion;-)
What could this be? There are no insects or anything in the tent. I use half the recommended amount of nutrients, and the light is 70cm away (can't go higher, the tent is too small).
Did you do any defoliation or perhaps topping? I actually cut a few pieces of new growth a few times when doing these techniques.. The result was the leaves growing like that with the rip / cuts in them.. I wouldn't worry if you know for sure it's not a pest.. Probably just an accidental snip.. Happy growing!! 👊
Yeah, I have to prune them very often, otherwise they block the light from the growing colas.. but I always make sure to only cut at the stem. When watering, I have to bend the ladies apart so I don't get everything wet.