IMO if you want to run a low nutrient system, have a damn good skimmer, possible some pellets, a refuge and clean your filter socks out every couple of days.
Weekly water changes is really the best it can get. Anymore than that and it would not really have any better effect then weekly.
You could always dose your tank daily if you wanted to improve coral growth, but that runs hand in hand with a real good skimmer and some other filtering options.
A real nice filter option that i personally prefer to over kill are filter feeder corals like brains, frogspawn, zoos, acans, etc. And a bunch of clams to eat at the nitrates are nice to....and the fact that coral produces oxygen during the daytime while the lights are running(photosynthesis) which is beneficial for your fish and the live bacteria culture in your ecosystem.
But yah, daily water changes are a unnecessary overkill unless you are dealing with a cycling tank or bacterial algea or a major ammonia/nitrate/nitrate spike.
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