Quote:
Originally Posted by eWarren
WOW, if this is real, but then why does all fish shop staffs recommend people to do water change? Or do you need a huge skimmer / refugium so one can get away from water change? 
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Reef tanks require the removal of organic waste & detritus and as Steve said, the replacement of depleted minerals or such.
How thats achieved is variable. Water changes, good skimmers, large algae refugiums or algae turf scrubbers, carbon, ozone and the replacement parts handled by again water changes, reactors or the addition of 2-part supplements.
Most of the experienced aquarists use a combination of water changes & filtration to achieve beautiful tanks such as those displayed in our feature,s.