The Learing Center on BYC says humidity should be 50% for the first 18 days of hatching. I have read others say 40-50% yet on the hatching forum here i read a lot of ppl have their bator set at 20-30% humidity My bator directions said to error on the side of less but doesnt give a % only says "the air sack size etc" and then says you have to be experienced to read air sack and egg weight loss of weigh or gain correctly... The lady i bought my eggs from who raises chickens says 50% . I am confused... SO..Any long time hatchers out there with a lot of experience ...PLEASE...what is the RIGHT humidity the first 18 day to get the biggest hatch success? ONLY long timers in successful hatching please. ..