How often should we be opening to check whether there's wrinkling or droplets hitting the eggs? How do we know the humidity isn't too high or too low?

Would it be safe to say that if we maintain a constant temperature of 86 degrees, with the styrofoam ontop of, and around the tank, that there wouldn't be too much dripping on the eggs? Is there an amount of drippage that is safe? :/ You have me worried now about this drippage. Of course it's going to build up inside the box, right? I mean it will get humid in there. Yes?

Give me some tips to play it safe.

Also, about the vermiculite, how often should it be re-wetted? And what method do I use do approach that?