When I upgraded from the 180 to the 300 I mixed up 150gals in the new tank (getting temp and salinity the same), then did water changes back and forth between the two over a few hours then moved everything at once. Only lost a couple corals (they were questionable to begin with) and was carefull with feeding for a couple weeks. Total time to do the changeover was 6 hours (moving from one house to another)
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