I have a homemade incubator that while running sits at 100 degrees with 35-40% humidity. When not running it is 72 degrees with 70% humidity. I already have a pan of water in there (that gives me the 35-40% humidity when running at 100 degrees). What is the best way to up the humidity level to 70% for lockdown? Do sponges help release more water into the air than just a pan of water?