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I've found that many of the salts are extra loaded with stuff so when you do a 30% water change, it's very unlikely your mag/calc/alk levels are the same as in your tank. I change 15 gallons on a 110 every week and I still have one coral that freaks out nearly everytime and exudes filaments in several places (sps toxic tort). Just salinity and temp imo aren't enough matching for large water changes.