Yellowing and brown spots

300w led in black gold light nutes (verse and tea from local store) had them on 20/4 but I had put them on 24/0 for a few days cause I had cuttings in there with them them. Temps and humidity fluctuates a lot
 

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Yeah so the best way is a blue lab soil pH meter but they are expensive. You can make a soil slurry and pH that. Try getting soil from different parts of the pot.
 
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