For all of you out there who have only candled a little or are experienced but have come across another "iffy" egg, if there's room in the bator at lockdown time then there's no harm at leaving those iffys in as long as there is no smell, cracks or ozing. If you do decide to toss eggs, then always crack them open over a paper towel over the trash can (I usually snap a crack in them with a table knife). By looking at the contents & remembering what they looked like at candling, you will learn a lot for future candling. In the beginning, I was sure that some eggs were gonners, took them out & half heartedly cracked some open to find the occasional live one or two. It taught me a lot & I'm much more cautious, which gives the eggs a chance to hatch (albeit a slim chance).
Happy hatching everyone! Have fun playing with your chicks & appreciate every single one of them. They are such miracles & what a joy to be a part of it.