two day old dying chick

[reddog64]

I need to know if i build my. First refrigerator incubator temperature okay. Humid okay. Two days. After chicks. Hatch thy have a hard time breathing soon after thy. Dye. Thought. It would be permanent market i mark the egg. If anyone has. Into please. Let me know

 

[peepblessed]

Most people use pencil to mark eggs. I don't know if Permanet Marker is bad or not. Lack of vitamin B's can cause early death. I don't know what else would cause those symptoms. Hope you get some answers!