@ronott1 i did the tap test a few mins ago with no success didnt hear a thing :/ the sound of the shell sounds weird though if that makes sense. it almost sounds like taping on a ceramic egg is that normal?
I have noticed something similar... It seems the eggs that are bad have more of a hollow sound *and* they don't retain heat the way a viable egg does. I can usually tell just by temp which ones are not viable. Don't get me wrong, I'm not suggesting that you toss any based on temp or sound of shell, just think about it and use your experience in the future.
Disclaimer: I am a complete novice when it comes to incubation and hatching.
-Kathy