#calcium

Calcium pairs with alkalinity to build coral skeleton. Most reef keepers run calcium between 400 and 450 ppm, and let it drift inside that band rather than chasing a single number. The harder problem is keeping calcium, alkalinity, and magnesium in ratio — burning through one without the others stalls coral growth. Reef Trak tracks all three on the same chart and lets you log calcium reactors, kalkwasser, two-part dosing, and ICP results in one place.

Articles tagged calcium

Reef Chemistry · April 2, 2026

The Best Way to Track Alkalinity, Calcium, and Magnesium in a Reef Tank

Alkalinity, calcium, and magnesium are the three pillars of reef chemistry. Tracking them well is straightforward once you know what to log, how often, and what to do with the record.

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Reef Chemistry · March 11, 2026

Reef Tank Calcium: Target Range, Testing, Dosing, and Balance with Alkalinity

Calcium is the structural element that builds coral skeletons. It moves slower than alkalinity but matters just as much. Here is the complete reef-keeper guide to calcium, testing, dosing, and balance.

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