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I'm thinking about upgrading my lights and have my eyes currently set on these: http://www.aquadirect.com/store/product.php?productid=813&cat=371&page=1">http://www.aquadirect.com/store/product.php?productid=813&cat=371&page=1</a>
	
For those of you that have owned these hoods before, do you hang them over your tank a few inches higher than the tank or sit them directly on the tank?
				
			For those of you that have owned these hoods before, do you hang them over your tank a few inches higher than the tank or sit them directly on the tank?