the tubs depend on the size of the clutch. One thing I have noticed is, like with salt water tanks when it comes to water, the more humid air there is in the box the smaller your temp seems to vary. Same with an incubator, the more warm air there is in it the less its seems to vary from top to bottom (if the air is circulated).
So I use 12qt for 4-8 eggs and 15 for 8-14 eggs
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