Help!!!my babies are turning yellow!!!!

sooo i just got 9 new babies, they were healthy when i got them. they still seem like they are healthy... however the new growth(after 1 week) is turning yellow... I pH my nutrients at around 6.0 5.5 area i am using half dose on my COCO A&B like it says. and they are under a flo lite. (2x4ft flo lites). i dono whats goin on..... !!!!
 
here is a picture of the 5 that have it bad..... please help
 

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sooo i just got 9 new babies, they were healthy when i got them. they still seem like they are healthy... however the new growth(after 1 week) is turning yellow... I pH my nutrients at around 6.0 5.5 area i am using half dose on my COCO A&B like it says. and they are under a flo lite. (2x4ft flo lites). i dono whats goin on..... !!!!

were they clones from aero then transferred to soil?
 
i have seen plants that are just like yours and they where too wet. my buddy kept having problems like your's and was chasing zinc,cal,mg ... so last time i was over there i just repotted it for him and the soil was really wet. we used the exact same bag of soil FFOF but i made sure he watered less and now after about a week they are healthy as hell. not sure on your part but could be something to look at tho.
 
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