tonight at 6 is 18 days! I need to know what the best humidity is for an lg incubator with a personally rigged mini fan for circ should be. ( im thinking 65-70%) And also, should i use egg cartons and keep them upright , or should i lay them down on paper towels? Also, the air cells seem to have enlarged as the chicks have been growing, and at the pointy end i see a snake like looking thing, looks like a thicker vein or possibly the end of the yolk? This is my first time so maybe i am explaining it wrong! Are these things normal?