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Indoor Second Grow Ever! Northern Lights Auto.

So to me looks like your PH is low. This will cause the newer growth to be yellow and the old growth to be dark green. I would check your run off. This can cause your buds to be airy and affect the final yield.
 
If I was going to bet on it I am guessing your run off will be in the mid to low 5s.
 
Just picked up a PH600 meter. I was using a generic (crappy) pH meter before which told me my soil was slightly alkaline. I just used the PH600 and its reading my runoff at 4.8. Also, I haven't seen any significant growth in buds since it started flowering about a week ago. Anyone have any ideas how I can raise the ph since I'm already in flower? I'm going to be really bummed if this plant dies after all of the time and effort I've put into it.
 

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