]Hello Everyone this is my first time trying to hatch chicken eggs in the incubator(BRINSEA MINI ADVANCE) last time I hatched Japanese quail and had 8/11 successful hatch rate. in this batch of chicken eggs I have tried candling and it is currently day 15 and I am using an iPhone to try and see if there is any progress . and this is what I can see (picture ) but I can't seee like anything except for like a dark patch and an air cell as you can see - no veins or anything. They look the same every few days I am trying to candle .I don't know if this is because I am using an iPhone torch- so I have ordered a proper candling machine to see if that would give a better view . Any advice or does anyone can anyone tell me if these are fertile and if there is any progress PLEASE???? It would be much appreciated thanks all in advance!