Incubating can be really fun and frustrating.
Ducks and chickens have different incubating requirements. The ducks take a week longer to hatch, and require higher humidity.
It is an interesting incubator you have, what is it made from?
it's a propogator tray for plants, I made a hole for the light and some holes on the sides for water tubes to fill the water trays without letting the heat out!