First time yellowing leaves

Trying this out my first time growing the leaves are starting to turn yellow and brown and the nugs seem to not be growing fast.some are in 10 gallon pots some are in 15 I use water from a hydro logic to system.I pH them at 6.2 I feed them micro,bloom cal mag and Kool bloom any feedback???? Thanks guys

Are you growing in coco coir or soil

Root organics 707 soil