Northern Lights Auto (first timer)

Hi @B_Rock913! Well I usually start to LST when the plant has at least 3 nodes, and is a few centimeters tall so I can work on it. If the plant is growing too short / not vertically at all, I raise the light for 24-48h to increase the stretch, in order to be able to do some LST after. Remember that less is more, especially with autoflowering strains, you better not over-do it and be very gentle on bending/LST. Step by step in order not to stress the plant! Hope this will help, keep us updated and happy growing 👊

Looks like a Cal/Mag deficiency so I think you were right and remember that already damaged leaves will not recover. If the mottling stops spreading then you have successfully tackled the problem. Good luck.