Daily Dosing
4.8 mL
Monthly
0.1 L
Load
Mixed Reef
Daily 2-Part Dosing
4.8 mL
0.1 L/month
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Inputs
Result
Mixed reef at 50 gal consumes ~10 ppm Ca/day. Ca daily: 1.7 mL. Alk daily: 2.5 mL. Mg daily: 0.7 mL.
Inputs
Result
SPS dominant at 120 gal: Ca daily: 7.2 mL (1.8x factor). Alk daily: 10.8 mL. Mg daily: 3.6 mL. Total: ~22 mL/day.
Target calcium 420–450 ppm and alkalinity 7–11 dKH. SPS-dominant tanks run higher alk (8–10 dKH). Consistency matters more than hitting exact numbers.
| Parameter | Target Range | NSW Value | Test Frequency |
|---|---|---|---|
| Calcium | 420–450 ppm | 420 ppm | Weekly |
| Alkalinity | 7–11 dKH | 7 dKH | 2–3x/week |
| Magnesium | 1280–1350 ppm | 1280 ppm | Monthly |
Consumption depends on coral mass and type. A mixed reef with moderate coral typically consumes 10 ppm calcium and 0.5 dKH alkalinity per day per 50 gallons.
2-part dosing uses separate calcium chloride and sodium bicarbonate solutions dosed in equal amounts. Part A raises calcium, Part B raises alkalinity. They cannot be mixed together.
When daily 2-part dosing exceeds 100–150 mL per day. Calcium reactors are more cost-effective at high consumption rates and provide more stable parameters.
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Last Updated: Mar 19, 2026
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