My first grow problem. Leafs turning yellow, started two days ago. Today in the morning I’ve flushed them with pH balanced water with half of the recommended dosage. Under the clay pellets their in those Coco Jeff’s?
My light is around 80cm above them at full strength. It’s a hgl 260xl
The temps go between 80-84.
Humidity around 50 with a lot of air flow.
Strain Norther Lights auto.
Thanks to anyone who replies 
pictures taken approximately 11h ago.