First grow sensi seed autos

all have sprouted nicely, but hulkberry sprout only 2 out of 3 half of plants is in coco fed with canna coco a+b, (super skunk, hulkberry) half in biobizz light mix soil and biobizz nutrients (amnesia xxl, purple skunk, banana kush cake ) had some issues thinking i wouldnt need to add nutrients to coco this early, leaves starting to get yellowish