I have a metal still air bator that was given to me yesterday. By last night I had the temp staying between 99 and 100 and the humidity was 50%. So I put my first 5 eggs in. Overnight the humidity dropped to 37%. I changed the dish back to the metal one that came with the bator and it raised to 41%. It is staying at that. The temp stays the same. How can I get the humidity up to 50%? I would attatch pictures but can't seem to figure out how.