For humidity, I cover the majority of my top with foil and sometimes to up it I'll put a wet washcloth in between the foil and the screen top, or will mist a bit with a spray bottle inside

Again, being in SoCal it doesnt drop TOO much, but sometimes will drop into the 40's and I'll need to intervene

I just purchased a larger water dish that I'm going to try and see if that helps better than having to use a wet wash cloth