Your plants are very, very green. Your on par with nitrogen, but I think you're feeding too nitrogen heavy and now your potassium has gotten locked out. At least thats what it looks like to me. It could just be a potassium deficiency too, but how dark green your plants are tells me they got plent of nitrogen. Remember that no matter how much nitrogen a plant has available, nothing stops a plant from uptaking nitrogen so it will keep metabolizing it as long as it is present, not many plant nutrients are unaffected by the amount of other nutrients present like nitrogen is, but a few are directly effected by how much nitrogen is available, and potassium is one big one. Nitogen toxicity will start out as your plants becoming a deep forest green, as it continues it will start locking out potassium causing what looks like deficiencies, but in reality they are present but unable to be used by the plant because the nitrogen has blocked it out completely.
What soil are you using, and what are you ph'ing your water to? I see that you are using biotabs. If you mixed them in or top dressed your soil right away and your soil has fertilizer in it already this might have caused a build up of nitrogen in a peat based soil over time. Unfortunately the only thing you can do is to wait it out and water it out at this point if that is the case, also if your ph isnt being managed well this could cause a lock out of potassium as well but is easier to fix over time.
Also pop over to the autoflower infirmary page, doesnt matter if they are photos or autos. Start a thread there, at the top of the page will be a post from Mossy with a form you can copy and paste to your thread, fill it out. It has all the info everyone could need about a pictoral/info based diagnosis.
I know the following diagram is confusing but if you look at nitrogen and follow the line that leads to potassium, that line means that too much nitrogen leads to potassium antagonism or layman's terms potassium lock out.
The solid lines represent a negative interaction when the originating nutrient is to heavy the solid line an corresponding arrow and nutrients it leads to will be negatively effected. LOCKOUT
The dotted line shows a positive relationship, meaning the more from the originating nutrients will help your plant metabolize the nutrient the line and arrow is pointing to. HELP UPTAKE.
You will see this diagram floating around from time to time on there and it does get very confusing but it is to show the balance needed between all of a plants food for a plant to metabolize its required food.
