I have the brinsea eco 20 (?) and the directions said to fill one well with water til 18 days and then at lockdown fill both wells to raise humidity. I bought a thermometer/hygrometer at Walmart and when setting up, I couldn't get my humidity to around 40% without filling both water wells. (With one well filled it was only at 29% humidity.) So I have them both filled appx 3/4 full and my humidity holds steady around 40%. My eggs are now on day 10. Everything seems to be going well. I'm just wondering if anyone has had to fill both water wells to keep humidity around 40% or am I asking for trouble at hatch time with drowned chicks because I had them both filled the entire time?