Seachem Reef Calcium

Maintain calcium levels in your reef aquarium

At a glance...
  • Calcium additive to help maintain healthy levels of calcium
  • Accelerates coral growth
  • Does not alter pH levels
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Seachem Reef Calcium is intended to maintain calcium levels and is a concentrated (50,000 mg per litre) bioavailable polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering the pH level. Simply put, this means that the substance is active straight away, for quicker results. Polygluconate complexation has multiple benefits: it increases the absorption of the calcium, it provides a rich source of metabolic energy to help maintain peak coral growth, and it prevents calcium precipitation and alkalinity depletion. It contains no nitrogen or phosphates, so it will not cause algae growth in a well maintained reef tank. Reef Calcium can be used alone, or used with an ionic calcium supplement for superb results.

Key Features:

  • Maintains calcium levels
  • Does not alter pH levels
  • Substance is active straight away
  • Provides a rich source of metabolic energy to help maintain peak coral growth
  • Prevents calcium precipitation and alkalinity depletion
  • Does not cause algae growth


Add 1 capful (5 ml) per 80 litres, twice a week. You can increase the amount or frequency based on growth response but do not exceed 3 capfuls per 80 litres per day. Each capful will raise calcium by about 3 mg per litre.

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