How much ventilation needed in this homemade incubator during lockdown

ArizonaDesertChicks

Eggstactic for Pretty Eggs
13 Years
Dec 8, 2008
2,378
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Glendale, AZ
I built my incubator with a 10 gallon aquarium;

https://www.backyardchickens.com/web/viewblog.php?id=19548-homemade-incubator

I am now on day 19 with 18 good eggs inside, including some purebred wheaton/BW ameraucanas. Since this is a homemade incubator, there are no predrilled holes for ventilation and it is made of glass, so all ventilation needs to come from the top. I started lockdown yesterday and closed off the vents to keep the humidity up = was this a mistake? How much ventilation do the eggs need before the chicks hatch?
 

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