I was wondering, when chicks hatch in an incubator, do we need to leave them in there till all chicks hatch? If so, what if some don't hach till a day or 2 later? What if they are a little later then that? Are we aloud to open the incubator to remove the chick? With the octagon 20 incubator, do you have to remove the bars between the eggs when hatching begins?