Is the white light on 24/7? Perhaps a red light would let them sleep? I would check them over really well for mites, vent , under the wings. Can you post a close up of one of the chicks and explain what seems off to you.
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Honestly, I'm not sure. There were some mite-like specs, but not many or very big or moving, really.
I thought mites too,but I don't know.