Seachem Reef Status Calcium

Seachem Reef Status Calcium is a titration test kit that measures the calcium level in your reef or marine aquarium with lab-grade precision. Calcium is one of the pillars of a healthy reef, and this kit delivers 150 accurate tests through a rapid three step procedure, so you always know exactly where your levels stand. It is a natural companion to the rest of our water testing gear and saltwater supplies.

Why Calcium Matters

Corals, clams, and coralline algae constantly pull calcium from the water to build their skeletons and structures. If calcium drifts too low, growth stalls and new tissue struggles to form. Most reef keepers hold calcium between 400 and 450 mg/L, and the only way to dose with confidence is to test first. Guessing leads to swings that stress your livestock.

How the Test Works

• Simple 3 step titration. Add the reagents to your sample and count drops to the color change. No guessing against a printed chart.
• Sharp, precise endpoint. Reads down to 5 mg/L, precise enough to catch small shifts before they become problems.
• Reference validation included. A known standard lets you confirm the kit is reading true, so you can trust your numbers.
• 150 tests per kit. Plenty of testing for a long stretch of reef keeping.
• Requires DI water. You supply clean deionized water for the procedure. It is not included in the kit.

Specifications

Recommended Pairings

• Seachem Reef Advantage Calcium, raise calcium back to target when your test reads low.
• Seachem Reef Calcium, a bioavailable liquid calcium source for daily maintenance.
• Seachem Reef Kalkwasser, boost calcium and alkalinity together through your top-off.
• Seachem MultiTest Reef Special, add phosphate, silicate, and iodine testing to round out your reef panel.

FAQ

What calcium level should I aim for?
Most reef aquariums run well between 400 and 450 mg/L. Keep it stable and in step with your alkalinity and magnesium rather than chasing a single number.

Why do I need DI water?
The titration procedure uses clean deionized water so nothing in the water skews your result. DI water is not included, so have some on hand before you test.

How often should I test calcium?
Weekly is a good rhythm for most reefs, and more often in a heavily stocked SPS tank or whenever you change your dosing routine.

Does this kit test alkalinity too?
No, this kit measures calcium only. Pair it with dedicated alkalinity and magnesium tests to watch the full big three.