6 Jock Horror Autos - Coco Coir Grow

Quick update. There are starting to take off finally. 2 days ago I switched from 24/0 to 20/4 lighting because I did various reading on the subject and 24/0 will effect yeild in autoflowers. Also, I added superthive to my feedings. Still feeding at npk 3-1-2, Epsom salts 1/4 teaspoon, phed tap water at 6 to runoff daily.
Will be ordering some different pH down. Currently I am using earth juice, but obviously citric acid in coco isn't pH stable. My tap water is at around 7, when I feed its at 6. My runoff is at 7. So I will try a different pH solution.
Only problems are 2 plants doing a taco on oldest leafs. My assumption is my humidity was to high, since my humidity has been around 50 percent and has seemed to correct itself. Other then that the plants are taking off.

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