Help! I'm hatching OEG x Silke eggs, my incubator doesn't have a humidity monitor, I've been following the instructions booklet and adding about 100ml every two days but today is day 19 and I still don't think the air bubble is quite as big as it should be! I have stopped adding water and went into lock down yesterday, I am hoping my Wednesday the air bubble will be big enough for a successful hatch. Is there anything I can do to help the process? It's my first hatch and there is only 10 eggs that all seemed fertile and active last time I candled them!