This is my first time incubating eggs. I am using an older little giant 10300. On day 18 I filled the reservoirs,added a saturated sponge, and was able to obtain 70% humidity. It is now day 21, one chick has hatched and one is pipping; however, the sponge is now dried out, the reservoirs are very low and the humidity has dropped to about 50%. I do not know if I should risk opening the lid to add more water, or let the situation stay as is. I tried to add more water through the ventilation whole at the top, but I am not obtaining the spike in humidity that I am looking for. Any advice is greatly appreciated!