Originally Posted by chemist308
This question is for those who control fermentation temps with an aquarium heater. Do you put in anything to ensure some circulation of the water bath you use?
I use a hydor Koralia aquarium circulation pump. Cheap, fully submersible and very effective. Without that, my water bath would be hot near the heater and cold at the sensor. Maybe my outer container is too tight for the carboy. With the circulation pump, temps are very stable.