Sachem Reef Advantage Calcium is equivalent to dry Reef Complete. It is a non-caustic (pH 8.3-8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios. This allows one to maintain these two important elements while maintaining calcium. If either usage or precipitative loss results in a more rapid loss of either magnesium or strontium, then Reef Advantage Magnesium, Reef Advantage Strontium, or Reef Strontium. may be employed. Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. Used as directed, it will not deplete alkalinity.
Sachem Reef Advantage Calcium is equivalent to dry Reef Complete. It is a non-caustic (pH 8.3-8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios. This allows one to maintain these two important elements while maintaining calcium. If either usage or precipitative loss results in a more rapid loss of either magnesium or strontium, then Reef Advantage Magnesium, Reef Advantage Strontium, or Reef Strontium. may be employed. Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. Used as directed, it will not deplete alkalinity.
in 3 offers
The lowest price for Seachem Reef Advantage Calcium 250g right now is $18.00 at Nature Aquariums, compared across 3 retailers.
The all-time low was $9.00 on 30 Nov 2025 — today's price is 100% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 6 July 2026.
Seachem Reef Advantage Calcium 250g
Sachem Reef Advantage Calcium is equivalent to dry Reef Complete. It is a non-caustic (pH 8.3-8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios. This allows one to maintain these two important elements while maintaining calcium. If either usage or precipitative loss results in a more rapid loss of either magnesium or strontium, then Reef Advantage Magnesium, Reef Advantage Strontium, or Reef Strontium. may be employed. Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. Used as directed, it will not deplete alkalinity.
Sachem Reef Advantage Calcium is equivalent to dry Reef Complete. It is a non-caustic (pH 8.3-8.6) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater. Calcium and carbonates are essential to all coral growth. If either becomes deficient, coral growth will cease, followed by a rapid decline in coral health. Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios. This allows one to maintain these two important elements while maintaining calcium. If either usage or precipitative loss results in a more rapid loss of either magnesium or strontium, then Reef Advantage Magnesium, Reef Advantage Strontium, or Reef Strontium. may be employed. Unlike limewater (kalkwasser), Reef Advantage Calcium does not have a caustic pH and will not deplete magnesium. Used as directed, it will not deplete alkalinity.
Last updated at 06/07/2026 17:47:00
Seachem Reef Advantage Calcium 250g
Seachem Reef Advantage Calcium 250g
Seachem Reef Advantage Calcium 250gm (SC31608)
Delivery between 9–21 July $10
Seachem Reef Advantage Calcium 250g
Seachem Reef Advantage Calcium 250g
Seachem Reef Advantage Calcium 250gm (SC31608)
Delivery between 9–21 July $10
