Oh thanks! I will have another look. I can't see much when I candle, just the air sacs. At least I am hand turning and don't have to worry about shutting the turner off. I just worried about not turning the muskovy eggs and you taught me something valuable!! Thank you SO much!Muscovy eggs are creamy coloured if that helps at all (I only have Muscovy so not sure about other duck egg colours).
If I was you I'd keep an eye on when some of them started to pip internally and only lock down then. But that's just me (plus I love to candle and see what's going on).