Randy Holmes-Farley
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My Tank Thread
The cooling set up is a "cool" idea (pun intended). I did something similar with heat on my reef years ago. Obviously I had to have a little different equipment used 1/2" pex around 200' in a 100g stock tank fed from my water heater through a ranco pump/controller (heat pump) back to the water heater. Did a good job with only a little bit of temp drift. Was more "efficient" in cost for operation as it was cheaper for natural gas than electricity.
I've thought about that sort of idea, but never tried to do it. Seems above my pay grade for DIY. lol