This is my first time incubating chicken eggs. I have a Sailnovo 12 egg incubator that keeps saying the humidity is too low and the manual is not very helpful in fixing the problem! Can the vent be closed? I'm worried not enough fresh air will get in but it does help the temp reading (100.1-100.5) and the humidity reading increase if I do close it more for a while. I'm stressed out and don't want to mess it up! We're on day 4. I've read about adding a wet sponge but not really sure where to put it on this model. There doesn't seem to be enough room inside without interrupting the turner. Any help appreciated!