I have had my eggs incubatting in my little giant for 18 days. I went and bought a hygrometer today and was going to put it inside and lock the birds down for the hatch.When I returned from the store the eggs are rolling and moving, should I leave it shut or open it to put it in. I filled all the water resevoirs full last nite and even added a soak tea towel under the screen. This is my first hatch and I really don't want to mess it up. 23 standard light brahma eggs. Any advice would be appreciated.