cookie auto

Hi everyone so its been a while to post but recently two of my autos started showing the same type of leaf yellowing can anyone identify the correct deficiency.. thank you in advance… Peace ✌️ And btw they are in the middle of 6th week

So hellow gang … here it is my journal i want to introduce my humble garden and ladies to you .. :) hope you enjoy This is my latest photo as i just switched the cycle from 18/6 to 12/12 because my gorilla is photoperiod plus i will soon add photos of my first ever harvest too :) peace out