Concentrated calcium supplement: Enables precise control over calcium levels for reef tanks
Pure calcium formula: Prevents disturbance of aquarium balance by delivering only calcium
Safe dosing: Increases calcium by approximately 25 ppm per 1 US gallon (3.8 L) per ml
Gradual administration: Allows safe and controlled calcium raising over time
Long shelf life: Stays effective for up to 24 months when stored properly
Summarized by Shop
Calcium²⁰+ is a concentrated calcium supplement formulated for reef aquariums. It is intended for maintaining and correcting calcium levels that fall below the natural seawater range (400–450 ppm). Unlike blended maintenance formulas, Calcium²⁰+ provides calcium alone, making it ideal for safely raising levels without disturbing balance.
Form
Crystals
Solubility
May redissolve below 15°C when warmed
Shelf Life
24 months
Storage
Store tightly sealed in a cool, shaded location (25°C/77°F)
Calcium Increase
25 ppm per 1 US gallon (3.8 L) per 1 ml
Recommended Dose
1 ml per 1 US gallon (25 ppm calcium) or 2.5 ppm calcium per 10 US gallons