"Aloha" Chicken Egg Hatch-a-Long!

No candling does not bother the growth/success rate of the egg hatching. It doesn't bother anything at all. Just don't candle from day 18 to hatch day.
I disagree that candling absolutely doesn't change the growth/success rate of the egg. When done right, yes; candling has minimal potential to cause issues, but it is never completely and entirely safe, simply because human error exists and you are exposing a fragile egg to a non-controlled environment.

This article discusses the subject and what could go wrong in detail, but to summarize in my own words: You could drop the egg when candling, you could expose the egg to bacteria in the air or on your hands, and you're disrupting the delicate environment of the incubator itself, the effect of which is multiplied if you have a finicky incubator. If you really value a specific batch of eggs, it's better to reduce the amount of times you candle to minimize the chance something goes wrong. That being said, some people candle every day and get 100% hatch rates. The effect of candling is hard to study past anecdotal reports because certain eggs are just more survivable than others, everyone has different incubators/incubation methods, and there's just a ton of factors that contribute to an egg successfully hatching. I prefer to err on the side of caution.
 
Day 15 is here! I went through and candled every egg and here are the results:

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A3- already discarded, not fertile.
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B2- already discarded
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B8- didn't manage to get a picture, but it looked pretty much exactly like B7.

I chose to discard B6-B8. I am confident that those ones were no good. I wasn't really expecting them to make it to lockdown because those three were all cracked eggs. A4 has always been a bit behind in development so I'm giving it a pass for right now; it looks better than the picture makes it seem and I did see movement. A9 I left for now, same with B1, but both I'm probably going to re-candle tomorrow and toss them. B5 I'm also suspicious of and will re-candle to see if I see movement. But things are progressing along. The rest of the eggs had growing, active chicks in it!

Edit: Recandling made me realize I mislabeled 2 of the pictures, A11 and B1. B1 was alive, A11 was not. A11, A9, and B5 were all discarded.
 

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