I could really use some help to identify my problems please First time growing in dakine lite coco, gg4 autoflowers in 3 galling bags

Might be nute burn. What are you feeding them in what medium?

I have been feeding them advanced nutes micro, grow and sensi cal in r/o water with a 6.2 ph in dakine coco coir lite 70/30 coco/perlite