Why are my plants a little light green

Update: I had 22 plants running in a 4x4, obviously that was way too many, so I got rid of 5 for now.

The plants seem a little on the brighter green side, I was wondering if anyone could give me a suggestion as why!?
All organic nutes from homegrowncannabisco.

17 plants now, running blue dream, and skunk#1 feminized-seeds.

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This is natural in new growth. It just simply has not processed all the chlorophyll and should be fine in a couple days.