Yellowing leaves on auto

What's up everyone I'm currently growing 5 autoflowers and on 2 of them most of the leaves are starting to yellow starting from the tips. I haven't used any nutrients so I'm assuming it's a deficiency and was just wondering if anyone knew what kind. Thand for any input

ill probably get yelled at for not looking at all the guides but the pictures arent working on there for me

Yellow light makes all the leaves look yellow... new pic, white light.

Maybe some more info...