I'm an opener, but I also know that before I open my humidity is at least 75%. With you not having a hygrometer and not knowing the humidity, I'd be a bit more careful. Only do what you are comfortable with. If at any time you have condensation, you know you are high and you can take advantage of that and open.I don't know. I haven't opened the incubator and I can't see well enough.
Is it ok to open? I don't want to mess up the humidity for the remaining two.
