Not sure what to do??? PLEASE HELP!!!

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How did you figure out that the air cell is full of liquid? I've heard of the condition before but never seen a way to determine that.  I'd be interested to know.

In the meantime before someone replies with a knowledgeable suggestion, my advice would be to leave it alone.

Best of luck!

Hmm.  I don't usually candle on Day 19 because I am already in lockdown, but usually the egg appears entirely dark except for the air cell by day 17 or so.  Is the chick still moving?  It looks to me like it might be a late quitter.  Still, I would leave it in and see what happens.  I usually pull eggs that have not hatched at day 24 (if everyone else hatched on time, meaning late day 20/early day 21.  If not, I would wait longer).

I would take a look at the candling through incubation thread and compare what you are seeing to those pictures.  Then, I would just leave the egg alone and put it back into the incubator.  I've never heard of anyone drawing off fluid, and that fluid is not in your air cell but beneath it, between the chick mass and the air cell.  If the chick is alive, there is way too much potential for it to bleed to death or get an infection if you start to mess with it.  As I said, I suspect it might be a late quitter, but I am not an expert.  I would leave the egg in the incubator and see what happens.

Still, the best of luck.

I agree with ChestnutRidge.  I would be interested to know too how you determined it was fluid especially since your humidity has been maintained at 35% to 40% throughout the incubation period. Can you turn off the flash on your camera? Just curious as most cameras have that option. 

The picture drawn of what you were seeing in the egg would be a normal dry air cell and a chick which had not yet absorbed all the liquid in the egg.  An egg looking like this on day 19 with a moving chick inside can still hatch, but may hatch later, in my experience.  It is just a little bit behind developmentally.  I have had them look this way and hatch.  Good luck with they rest of your eggs.