I do not recommend cutting unless one start to pip or you know when they are due to hatch.
Since I used the same setup, I know that my animals pip at day 60 so on day 60 I either cut everything or whatever has not pip on It's own.
What are the risk of cutting early?
Dryness - Bacteria Exposure - Twisted Umbilicus (same if you candle too often towards the end of incubation.
So my advice be PATIENT, yes cutting can save an hatching but it can also kill it.
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