I have read that many breeders experience issues with the fans causing the heat to go up. The thermostat won't recognize the heat because it is measuring the heat tape. So, if you have it set for 89, your thermostat maybe at 92 but the temp in the incubator is at 92 because the fan is producing heat.

I have a small Red Bull fridge and plan on putting 6 egg tubs in it. It will have about 2 inches of room between each shelf and the tubs will be right next to each other, side by side, 2 tubs per shelf.....3 shelves.

Does the fan have to be directly above the heat tape or can it just be anywhere in the incubator providing some type of circulation?