HighlandReefer
Team RC
I have been contemplating doing something similar. I was thinking about using an in-line fan that would fit in a 3"-4" pvc pipe & then bubble it into my 55 g. refugium. I would then control the fan with an extra temperature monitor to prevent the water temperature from getting too low or too high. I would then control the fan with a rheostat switch for fine tuning. 
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