Ok my hubby & I had made out bator out of a cooler but I just started doing a little more research & I found something that said we needed to drill 3 holes on one side for circulation..??? Is this true? We have our light bulb mounted on the side w/ the curve over the wheels & the chicken wire (hardware wire) that lines the bottom of the cooler also wraps up & around the bend as well so any hatched chickies can't get burned by the bulb. We have a small container w/ a wet sponge for the humidity, a digital thermometer that reads both temp & humidity, & the eggs are ready to go in unless we need to make modifications. Did we miss something, anything?! Thank y'all in advance!