Quote Originally Posted by bks2100 View Post
So around day 45 you guys open the tubs every other day just to let in fresh air?
Actually I open my tubs once a week during the first 6 or 7 weeks to cycle the oxygen and carbon dioxide. My incubator doesn't have a fan and those incubators that do, probably don't really need that step. After week seven when the oxygen demand increases and the internal temperature of the egg increases its probably a good idea to "vent" the egg tub a bit more frequently. Maybe every couple of days as the pipping starts to draw near.