I used 2 feet in my 4 cubic foot mini fridge, with these small incubators I think a little over kill on a good proportional thermostat is better than using too little flexwatt.
Dimmers and rheostats are the same, I use a zoo-med rheostat because my fan has a plug in feature, but for a computer fan I'd probably go with a dimmer switch because you'll be wiring it up anyways.
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