I candle nightly. I check at least 3-4 eggs. Candling should not compromise your hatch. I learned that one here after my first hatch was a bust and I thought that was the reason. The experienced hatchers told me that even if you candle every night as long as your hands are washed and your gentle with the eggs, and ddn't keep them out longer than 1/2 hour it shouldn't affect your hatch. They were right, that wasn't my problem, the faulty brand new thermometer (I never checked) was the problem. I control myself and like I said, I only spot check, but it's enough to feed my addiction, keeps me intuned to the air cells.To all those new to incubating eggs, do not over candle them! That is what I did wrong lol wanted to see the babies move so badly