I water change 5% every week on my 120gal system and my calcium never goes below 500. I have 3 medium sized SPS colonies and about 25 frags of SPS along with a full load of softies and LPS.
I also have a Kent drip system setup for dripping should I need to start dripping once the colonies get larger and deplete the calcium supply faster.
So far the small weekly water changes have sufficed.
pic from reefcorner .com
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