Dark spots on leaves.

Your diary is incomplete and a lot of the information people would use to help determine your problem is not an option. Its only one week at the 8th week and has no information on what your feeding it, PH, EC anything. If I had to guess, I would say this might be a lockout issue from either PH or overfeeding it. Again hard to tell given lack of information, Try adding more details and it should yield you a better answer. Best Of Luck! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***