Yellowing leaves

[ecc55]

First time grower. Started having yellowing leaves about 2 weeks ago. It started on the tips and spread inward. Affected most;y lower leaves now it looks like some of the newer growth might be affected.

My setup:
3x3 grow tent
Viparspectra 900W LED light
Black Magic potting soil in 2 gallon smart pots
SOG: northern lights autoflower X4, white widow autoflower x4
Seeds germinated January 27th
Dyna-Gro nutrients

Initially I was adding nuts every other watering , about twice a week. I went to nuts once a week and flushed with pH adjusted water. The problem seemed to have lessenesd a bit but the faint yellowing on some of the new growth is concerning. I wonder if this might be nutrient burn or overwatering?

 

[Chefbjy]

Since you're in a fabric pot it will be harder to overwater unless you water every day or every other day. You should be able to lift the pot and tell if there's water, or use the knuckle test. What was the pH run off? Did you check the sick plant guide? Looks like a nitrogen deficiency to me. How close are your lights? If you water every other day your pot and soil should be completely dry to avoid bugs and overwatering. If your soil is drying up that fast you may need a bigger pot or you might run into root problems.

 

[ecc55]

I water twice a week so I guess. I don't think they're getting too dry. I haven't checked pH of runoff but will. Lights are about 24 inches away. Thanks.

 

[Chefbjy]

http://www.growweedeasy.com/cannabis-symptoms-pictures