I have always been a fan of Sumps and running a good protien Skimmer. The one thing I am most glad of from back when I first got into saltwater keeping, was the advise from my lfs to not cheap out on a skimmer and go with a sump. I ended up spending the extra money for a good skimmer and went with a sump, and have reaped the rewards ever since. Also I guess you would have to take into consideration of your tank size, if it is a small tank and lightly stocked then routine water changes could work. If you are not sure about how heavy the stocking of the tank will be then the protien skimmer and sump route would give you more future options.
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