But be careful with the veni, natural weed killer in high doses. In low doses apple cider vinegar has all kinds of good shit for plants tho. With all that coco, and you get pH balanced. They gonna be starving for nutrients once they uptake. In all reality, your light green is mostly caused by lack of nutrients. pH affects nutrient uptake. But from pretty much everything I’ve read it’s low pH you gotta worry about. If it’s a little high it will drop as the plants feed. Most nutrients are still available at higher than lower too, gotta feed day 1 in coco though. And outside top soil isn’t gonna help that matter. I know you are using compost too. But that won’t last long with cannabis unless it’s a living soil
I still feel this is a very generalized answer overall, I kind of killed the topic diverting it from the pH discussion of knowing it needs to come down. Beyond that you’re gonna need to add more compost or a tea or salts. did you soak your coco?