Just lots of over feeding man , I would advise that you stop feeding with nutrients and only feed with ph corrected water for the next couple weeks to help flush out the excess of nutrients that has been given . Your're seeing yellowing in the vains of your plant due to mag deficiency you can fix this by simply adding abit of CalMg to your nutrient solution . I would consider doing this once your yelling in your leaves comes to a slow . You might wanna also reduce the amount of nutrients that are in the mix , the mix seems pretty strong and this will also cause your plant to yellow up and get burns . Over all you're rocking and rolling just a few things to fix up and you're going to be golden . I hope you find this information useful in understanding whats happening here ! -Happy Growing!