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Water changes are the single easiest maintenance task in keeping a saltwater tank.
In principle you can get away without water changes. But water changes are such as easy step that in one fell swoop accomplishes many good things for the aquarium.
nutrient export
replenish trace minerals
removal of refractory DOM
stabilize salinity
stabilize alkalinity
all these without the need for tedious and error prone testing, in a simple 5-10 minutes of siphoning and turning pumps on and off.
A more interesting question for a poll, in my mind, would be: if you dont do water changes, why not? Not saying people who don't are wrong -- you can definitely keep a beautiful tank with no WC -- but I'd be curious what people are perceiving as the benefit.
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