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Lace rock is pretty common in african cichlid tanks as a buffer to help raise pH. In a sw tank, the pH is already going to be high enough that it won't have any effect. Live rock from the ocean is about the same in its buffering capacity.
google has alot of conflicting info, alot of people give opinions based on things they do not know.
our live rock is still a calcium carbonate based rock. its just comprised mainly of aragonite where as lace rock is like limestone, both still calcium carbonate but they are mined from the earth, not taken from the ocean