Garage tank question

[dabandit]

I have this idea of enclosing the sump in a insulated box and putting a small thermostat controlled space heater in there,I would then vent the box to blow air up the display side in front of the glass. Im thinking spray foam on the other 3 sides,hoping my vent idea would keep the un insulated side warm. Another idea I had was to duct the exhaust off of the halides to blow on the display side of the tank,this would save a little more power by reusing heat I'd be wasting anyway. I'd like to hear more opinions if you got em,thanks