Why add unecessary pumps and equipment if you dont need it? Much like MH lighting if you dont plan on keeping much in the way of SPS why go thru the expense as long as you account for waste removal in several of many ways (skimming, refugiums, water changes, Kalk, algae scrubbers, dsb, etc..) I know my methods dont agree with what many people here do, but I and many others that I have helped in this hobby have been v. successful with out a skimmer.
-erik