I candled our 9 shipped eggs yesterday at Day 4.5. 3 out of the 9 had the dark spot and veining and looked great. One showed possibly a blood ring, but I wasn't sure. One had a detached air cell and no development. The remaining 4 had no development. Today I recandled just two of the ones that weren't developed, on day 5.5 and saw the same thing - zero development. I am using a quality candler and they are white Silkie eggs. I would love to give them all the benefit of the doubt. They are under my Silkie hen who is extremely diligently doing her job - no worries there. When would you recommend I next candle them, and given what I am presently seeing (basically nothing but a yolk) is there any danger to leaving the eggs there? When is the make-or-break time where I need to toss them to be sure the remaining eggs stay good.