I wouldn't do that. What does your unit say the humidity is? A separate hydrometer is a wonderful thing to add too. You might want to pick one up at the store tomorrow and then "salt test" it to make sure it's accurate. What did you keep the humidity at with your last clutch? Anytime I need to raise the humidity, I like to use a kitchen sponge in a small shallow dish and add water to the sponge as needed.Maybe a lightly damp paper towel over the eggs until then would work to maintain humidity for the eggs?