What measurement in a reef tank indicates carbonate hardness and the water's ability to resist pH changes?

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Alkalinity, measured in degrees of carbonate hardness (dKH), is essential for coral growth because corals consume carbonates to build their calcium carbonate skeletons. Most reef aquarium (Deals) keepers aim for 7-11 dKH and test at least weekly. Stable alkalinity is often considered even more important than calcium levels for long-term coral health.

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