Product overview
Red Sea Foundation A Calcium+ is a liquid calcium and strontium supplement for marine tanks. Skimming and coral skeleton growth pull calcium from the water. If calcium is too low, skeletal growth can stop and colour can fade or brown.
It is a concentrated mix of calcium and strontium salts in a seawater-like ratio, for use with Red Sea’s Foundation alkalinity and magnesium additives.
Key features
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Calcium and strontium: Salts in the biological ratio used for coral skeleton formation.
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Calcification: A stable calcium supply is the main structural building block for coral skeletons.
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pH, alkalinity, and magnesium: Works with the other Foundation parts to keep high-demand reefs in range.
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Liquid ions: Ready to use without converting dry salts in the tank.
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Low residue: Inorganic salt mix; not an organic food, so it does not add the same waste load as coral foods.
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Dosing hardware: Formulated to limit crusting on tips and pumps.
Water and system compatibility
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Water: Marine and reef aquariums only. Not for freshwater or planted tanks.
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Livestock: SPS, LPS, soft corals, and calcareous algae.
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Doser: Stable unrefrigerated and unstirred in a dosing container.
Dosing and instructions
Always follow dosage & directions on product packaging.
Calculate true water volume. Typical daily use per 100 litres, aiming for 410–450 ppm calcium:
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LPS / SPS frags and growing tanks: 1 ml (raises calcium by about 2 ppm)
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Mixed reef: 1 ml (raises calcium by about 2 ppm)
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SPS-dominant: 2–5 ml, matched to skeletal uptake
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Ultra-low nutrient (ULNS): Dose to match measured uptake of Foundation B (alkalinity) and Foundation C (magnesium)
Keep calcium stable so it does not precipitate. Test before large changes. A Red Sea Calcium Pro test kit is suitable. Do not raise doses without testing.
Storage
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Bottle: Cool, dry cupboard out of direct sunlight. Do not refrigerate or freeze.
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Doser: Flush lines with RO/DI water from time to time so delivery stays accurate and tips do not crust.
Specifications
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Brand: Red Sea
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Range: Reef Care Program (Reef Foundation)
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Size: 500 ml / 1000 ml
