The 6 hens I just bought were housed with a Roo. So I built an incubator and thought we would try hatching some. The Roo and 5 of the hens are Black Sex Link. The other hen is an Americana. Only four of the hens are laying and all the eggs are brown. Candling is done a 3-5 days after placing the eggs in the incubator, correct? I'm new to this and really don't have a clue! I figured the eggs they lay will probably be fertile for the first two weeks? How old does a Roo have to be to be fertile? Thanks, in advance!