While setting up my new tank, my previous tank ran as SPS only for a few months. Even though I continued with my regular water changing schedule, the corals declined due to the lack of fish feeding/pooping. All other aspects of the tank were unchanged.
My guess is that those tanks you are looking at are plumbed with natural sea water.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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