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Try not to worry too much. I've been hatching for a year now, mostly with shipped eggs, and to me it seems like a 50/50 chance to get a good hatch or not, regardless of what I do. Sometimes none hatch, and sometimes it's around 50% (only once did I get 100% to hatch from shipped-eggs, and I had put them straight into the incubator upon arrival - go figure - but those were BLRW anyway, not marans). With my own eggs at home (not shipped), 100% hatch is normal, but with shipped eggs, 40% is "normal" so I think most of it has to do with how rough they were handled during shipping. With marans eggs, my advice is "don't throw them out if you don't see anything inside when candling". It's hard to see anything through the darker shells, compared to other breeds. Once I cracked open a marans egg that looked empty when candled, and it had a small baby inside! (so sad - my mistake). I would just smell each egg once every few days, and if any smell rotten or start oozing little dots of goo that look like sap, then throw those particular eggs out.