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Re: Heating and cooling tanks

I've seen tanks cooled with a "dorm fridge".

Drill two holes in the wall of the fridge, put a large amount of coiled 
copper tubing with each end sticking out of one of the holes with insulation 
putty filling the holes and acting as glue. Run the tubing (you can use 
regular silicone plumbing for this) to your sump, one end attached to a low 
power pump. The water should move slowly enough through the copper tubing to 
cool it to nearly freezing, but not so slowly that any part of the water 
freezes. You may need to move the tubing lower in the fridge if freezing 

Don T