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					Originally Posted by BlueWorldAquatic  If money is an issue, get A nac6.  For the $50 more I would get a nac7, cone skimmers are much more efficient.  
 If footprint is important, the nac6 will fit in more places than the nac7
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 I wasn't aware that this had been proven so definitively re: cone skimmers.  My impression was that recent research is showing no significant difference between cone and cylindircal skimmers.
http://www.advancedaquarist.com/2010/1/aafeature