So this year I have been using a Repti-bator incubator but the problem is I have two clutches in egg boxes inside and that all that’s it’s going to hold. I have one more clutch coming and my 1st clutch is due to hatch in 5 or so days. To be on the safe side I made a new incubator out of an old mini fridge. I am using 6 inch heat tape and it currently has two racks. I mocked up two egg boxes to see what temps they are. The top rack is holding at 90 and the second is at 88. If I drop the thermostat temp then I get 88 on the top and 87 on the 2nd rack. Since both of these temps are in the range of the normal incubating temps. Should I add a fan or just leave it?