This is only my second hatch so I'm brand new to this hobby also. My first hatch involved 2 homemade incubators (styrofoam, 12 watt lightbulb, and sponge for humidity). I only ended up with 3 total chicks from both Bator's. Two chicks hatched on July 15th and One chick July 19th. I waited till day 7 to candle but now I've been reading that some candle as soon as 72 hours. I loved reading that because I was completely in awe watching the embryonic development! I couldn't keep my hands off them and candled frequently after 7 days. This is so much fun!