So, i went and bought some copper maran eggs from ebay and tried to hatch them. Wasn't able to get any to pip or hatch. Had 15 eggs overall. I checked the inside of the eggs and 4-5 had a black fetus which took up most of the egg and one fetus which was under developed. The rest were yellow yolk and runny texture. I'm not sure if this is something to do with the humidity or temperature. I wasnt able to candle the eggs because they were dark and couldn't shine light through them. any help is appreciated. I also wasn't using a secondary thermometer so temp might have maybe different than the incubator stated. I did use a second hygrometer though which was calibrated with the salt water test. the humidity during lockdown was 80%+ so not sure if that killed them.