🧪 Calcium Dosing Calculator
Calculate the right calcium supplement dose to maintain optimal levels for coral growth.
Reef optimal: 400-450 ppm
Results
Dose Amount
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Don't raise calcium more than 20 ppm per day
Calcium Change
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System Volume
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Note
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CaCl₂: 1 tsp per 10 gal raises ~10 ppm
Target: SPS corals prefer 420-450 ppm, LPS/Soft 380-420 ppm
Safety: Max 20 ppm increase per day
Target: SPS corals prefer 420-450 ppm, LPS/Soft 380-420 ppm
Safety: Max 20 ppm increase per day
Calcium for Coral Growth
Calcium is a critical building block for coral skeletons and coralline algae. Stony corals (SPS and LPS) consume calcium continuously, and levels must be maintained through supplementation.
Optimal Calcium Levels
| Tank Type | Target ppm | Consumption Rate |
|---|---|---|
| SPS Dominant | 420 – 450 | High (10-30 ppm/day) |
| Mixed Reef | 400 – 440 | Medium (5-15 ppm/day) |
| LPS / Soft | 380 – 420 | Low (2-8 ppm/day) |
Always dose calcium and alkalinity in balanced amounts. The BRS 2-part system maintains this balance automatically when equal parts are dosed.