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 I used a 12volt wall wart that was on the same timer as my lights.  So I only ran the fans when the halides were on in the winter.  All day long in the summer. 
				__________________210 Gallon slowly gaining population.
 
 Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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