Thanks for the welcome and the ideas.  The canopy that I built does not have fans yet because I'm still in the market to find a power supply for my LED's and fans.  I like the idea about the cooling tube, but I think that the tubing material (abs, pvc...) will insulate the temperature differential too much.  I like the idea to cut down on evap, though.  I would try it if I had room in my canopy that wouldn't interfere with the lights (210 watts of 420nm and 10KK flourescents).  Rich. 
		
	
		
		
		
		
			
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				90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
			 
		
		
		
		
	
		
		
	
	
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