Hhmm, not sure but should be ok.. Do you have a hydrometer so you can see what the humidity is? They are inexpensive and give you some peace of mind too. The washcloth was a good idea, especially if your troughs dry out so fast.
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Hey, I'm on day 18 also! I didn't weigh my eggs but all 5 are rocking here and there. I try to keep my humidity between 65-70, you don't want it lower than 55% for sure. I'm thinking you could either add towels or just add a little water at a time to the other trough until your humidity is at a level you want, just keep an eye on it in case you need to add more water.
I'm really hoping that I kept the temps better this time at 102 for still air, my first hatch was about 3 days late and this one seems to be right on time. I didn't have any rocking eggs this early with the last one. As long as they don't try to hatch Saturday as I wont be home most of the day and will miss it. I am so excited I find myself staring at them too much and driving myself nuts.
Good luck with yours, don't worry too much about them not moving, they could be doing a lot of resting getting ready.