All experiences are noteworthy and adds to the pool of knowledge.I have also done water candling, but only on eggs that were already a few days past the hatch date. I put 5 in the water, one at a time, and four of them did nothing. One egg did wiggle, and when I took it out and put it on a paper towel it rolled a bit. I opened the ones that had done nothing and the chicks were DIS. The other one I put back in the incubator, and it moved a bit off and on but never pipped. I lost that chick as well late the following evening. But at least I knew that I had given it a chance by putting it back in the incubator. I wouldn't rely on water candling as the definitive answer, but it can be just one more tool we can use when we have some doubts. BTW, I'm new to hatching and still learning here, so defer to those with much more experience than I have - I sure do!!