Actually, it doesnt. I do a slow, long, 50% water change using an air line hose. Something to keep into consideration when doing water changes with non-photosynthic corals is food in the water column. When I do a water change, I actually add additional food when I do so. Part of the reason why is with absence of food in the water column you will notice that most gorgonians will stay closed for a period of time. It helps prevent that.
Mike