Blue Cookies ;) Photo.

Hey dude, awesome photos and great grow to date👍. I’m seeing potentially 2, possibly 3 issues here but it depends on what your referring to and leads to a couple more questions. #1 - if ur talkn about the mild variation in leaf colouring it could be a slight light burn issue. given the height of your light though and the other thing I’m seeing, I doubt it. If top growth gets progressively paler and the edges and tips start to brown and crack yeah this is it but too early to tell at this point and height is good. I’m def. leaning towards a nutrient issue - lockout specifically. You’ve got minor initial signs of burnt tips. I think the fix (at least where you should start) could be simple too. Ur running your ph levels at 6.5 and have been for a number of weeks. In a coco medium this is an acceptable part of the range but definitely at the very top of it. I’d drop it back down to 6 and wait and see if the issue progresses. You recently added more nutes to the mix so it does make sense. A slight drop in ph might help the nute uptake and you may not need to dial back the concentration at all. Again, very early stages and either/or can be easily corrected at this point. Overall, the grow looks fantastic, really good call on the scrog nets attaching to the pots and best of luck through flower👍👊