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Found these hang-on-tank options that sounds very cool. Anyone else tried it out? Can it replace skimmer/filter media? http://www.amazon.com/gp/product/B00BP0MXX6/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A7FXQ8ZDORS3N I think Santa Monica was a member here once upon a time but I don't see any...