I've heard different stories about the humidity. Basically I read to keep it around 50% then raise it at the end to 70%. But I discovered I have a higher death rate that way. They where dying just before pipping. When I opened up the eggs there was a dead chick with the yolk absorbed. So I figured they drowned. So I lowered it to between 50 and 60% and the chicks come out sticky and I have to fluff them up after they dry myself or wait several days for them to rub themselves fluffy. I actually had most of a hatch fluff up when they dried and wasn't sticky when they hatched with the humidity around 45%. So, what ever works for you I would say. I don't mind fluffin them up myself, but they do. I don't leave them in the bator either. When they dry, they come out unless they are weak. I take them out and fluff them if needed and they go in the brooder. I don't like my bator to get all pooped in.