Hiya guys. First time incubating! I placed 18 eggs in an incubator and when candling at day 8 removed the clears and was left with 11 little eggs developing nicely. I am now at day 12 and i have noticed that one of the eggs shells has started to discolour slightly around the air bubble edge. Its quite a light shelled egg (average colour to ehat you buy in the supermarkets) and its developing like greyish spots? Any advice at all would be appreciated as i am worried about it. I have recandled at the dark area is larger so i think its still developing but im not sure what the discolouration mean! Thanks guys!