Hello everyone. First time grower running into some issues here. I am growing Northern Lights auto. My plants are in coast of Maine stoning blend. We are on day 29 since germination. My lights are set to a PPFD of 600. They have been slowly turning yellow over the past week but it is slowly becoming more prominent. Now I’m starting to see spots on them. The new leaves are coming in nice and green. I’m not sure if this is a nutrient issue. I may have been under watering my plant from the start in fear of over watering. I did make a mistake and add Gaia green and worm castings on day 15 so they are a bit stunted. Any help would be appreciated. I’m planning on finishing this grow to learn more about what to do for my next run. I did add some worm castings and watered them today. The leaves sometimes droop a few hours after watering, but then return back to normal within 12 hours. Thanks in advance!
Edit:
This picture is right after watering. Soil completely dry prior.
PH 6.7
Water- Distilled
Temp 70.0F
Humidity 58%