Alright, so I have had chickens for about 3 years now and finally decided to incubate some eggs. This is my first time. So I bought a brinsea mini advance. I have read and read and read some more. lol So my issue is I am at day 15. I am in Nova Scotia and the weather has seriously been playing havoc on my humidity. It is a constant battle. 30% (inside the house) one day, 55% another and so on, so my constant checking of the INSIDE of the bator has been ongoing. Mostly, from the first couple days it fluctuated between 25% up to 45% inside. However, yesterday and the day before, I had instances where it hit 60-65%. At this stage in the game, I don't want them to drown, so have removed all water inside. I am also concerned that their airsacks are too small. I know that this is totally a learning experience and the more I hatch the more I will learn. So far, all eggs have developed relatively to each other, the same. I have movements and all that. I am just wondering if over the next 3 days if there is a significant growth in the size of the airsack.. Day 18, is this Friday night.