Typically with a full or nearly full bator you won't need heat sinks as the eggs will do that on their own by taking up so much of the air volume in the bator. Eggs don't drop internal temp nearly as quickly as their surface temp changes so will help keep the air around them warm as well. With fewer eggs the air temp drops faster since there is less solid mass to help hold temps stable. Jars or bags of water work well to help keep temps stable. I have also seen people use rocks that are of similar size to their eggs. Pretty much anything that will hold heat & replace air volume with solid mass will work.I haven't had any big variations except for when I candle/turn them but the bator's not open but for a few minutes each time and the temp goes back to normal really quickly so it doesn't worry me. But i think there will be room in the bator next hatch still even though I plan on about 30 eggs next go around ...
I have a staggered hatch going starting with quail yesterday & today & (currently) something hatching every few days between now & the 30th. I'm a chronic hatchaholicI'm late, but I would like to join please. I recieved a Farm Innovators Model 2100 for Christmas. Put my first eggs, collect from my hens, in a couple days later and none of them took. I figure my bator temp was way to hot, after I did some research. So, I adjusted some things and started a new batch of 10 eggs. Some went in on the 5th, 6th and one on the 7th. I hadn't thought to come here before placing again, so I am sure I have made more mistakes. I candled last night and I am pretty sure I have some veins going!!I know it is still a waiting game, but it is also quite exciting! Hoping to find some eggs to hatch from different breeds of chickens, than one's I already have, especially amerucana and olive egg layers! I am really wanting a bunch of different color eggs....a rainbow!![]()
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Good luck to everyone's hatch and thanks for the education I am sure I will be getting every day on hatch eggs on my own.

I never throw out anything that I think is a blood ring the 1st time I look at it. I have had so many that simply had a strange vein pattern when they 1st started out that looked like a blood ring at 1st. When I would candle them again 5-10 days later there would be a wiggly baby inside that wouldn't have made it if I had gone with my 1st impression.Well, I candled again (with an LED flashlight) this evening when I turned the eggs and out of 10 eggs, it looks like 7 have life for sure, one looks to be getting viens (its only been in since the 7th), one is porus, but I can see viens and one looks to have the start of a blood ring (dark red line in two places but not a ring or circle). So far so good...if I can just keep my hands off them!![]()