1st it’s a Northern lights auto from seedsman. Gave this plant a half strength feeding with the other two i am growing same strain and breeder. She started showing these spots so I flushed with spring water. And now she has the yellowing. Sent from my iPhone using Tapatalk
Rootbound and a really bad pH issue. Repot, flush and make sure to water to runoff (at least a quarter of the water should drain through to be discarded) every time. Once the plant starts to recover, begin feeding again at 20% strength, ramping up 10% to 20% stronger each successive watering. Don't exceed 80% max strength... Cannabis does far better with lighter feedings than heavy ones.