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Magnesium Supplements

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Magnesium is crucial to any saltwater tank that contains hard or soft corals. It plays a vital role in maintaining calcium concentrations. If the magnesium levels drop too low, it will be almost impossible to raise either the calcium levels or the alkalinity levels. Magnesium should be added in small amounts on a daily basis until the levels reach between 1200 and 1300 ppm to match the concentration found in seawater. Some magnesium supplements also contain iron and other elements.


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  • Reef Foundations C - MG (500 ml) Liquid - Red Sea
    Reef Foundations C - MG (500 ml) Liquid - Red Sea $14.99
  • B-Ionic Magnesium (1 Gallon) - ESV
    B-Ionic Magnesium (1 Gallon) - ESV $29.99
  • B-Ionic Magnesium (32 oz) - ESV
    B-Ionic Magnesium (32 oz) - ESV $15.99
  • Reef Foundation C Dry (Mg) 1 KG Powder - Red Sea
    Reef Foundation C Dry (Mg) 1 KG Powder - Red Sea $19.99
  • Magnesium Dry Supplement (750 gm) - Aquaforest
    Magnesium Dry Supplement (750 gm) - Aquaforest $10.99
  • Reef Foundation C - MG (1000 ml) Liquid - Red Sea
    Reef Foundation C - MG (1000 ml) Liquid - Red Sea $21.99
  • Reef Advantage Magnesium (1.2 kg) - Seachem
    Reef Advantage Magnesium (1.2 kg) - Seachem $17.99
  • Fritz RPM Liquid Magnesium Elements (1 Gallon) - Fritz
    Fritz RPM Liquid Magnesium Elements (1 Gallon) - Fritz $29.99
  • Reef Basis Magnesium Liquid (500 ml) - Continuum Aquatics
    Reef Basis Magnesium Liquid (500 ml) - Continuum Aquatics $14.29
  • CoralUp (16 oz) -   Caribsea
    CoralUp (16 oz) - Caribsea $20.99
  • CoralUp (8 oz) -   Caribsea
    CoralUp (8 oz) - Caribsea $10.99
  • Reef Foundation C (Mg) - (5 Liter / 1.32 Gal) - Red Sea
    Reef Foundation C (Mg) - (5 Liter / 1.32 Gal) - Red Sea $89.99
  • ME Magnesium (MG) Liquid - (1 Gallon) Concentrate Pharmaceutical Grade - MECoral
    ME Magnesium (MG) Liquid - (1 Gallon) Concentrate Pharmaceutical Grade - MECoral $29.99
  • Fritz RPM Liquid Magnesium Elements (16 oz) - Fritz
    Fritz RPM Liquid Magnesium Elements (16 oz) - Fritz $16.99
  • ME Magnesium (MG) Liquid - Quart (32 oz) Pharmaceutical Grade - MECoral
    ME Magnesium (MG) Liquid - Quart (32 oz) Pharmaceutical Grade - MECoral $14.99
  • Reef Advantage Magnesium (600 gm) - Seachem
    Reef Advantage Magnesium (600 gm) - Seachem $13.99
  • ME Magnesium (MG) Powder - (Makes 1 Gallon) - Pharmaceutical Grade - MECoral
    ME Magnesium (MG) Powder - (Makes 1 Gallon) - Pharmaceutical Grade - MECoral $24.99
  • Tech M Magnesium (16 oz.) - Kent Marine
    Tech M Magnesium (16 oz.) - Kent Marine $8.99
  • Tech M Magnesium (1 gal) - Kent Marine
    Tech M Magnesium (1 gal) - Kent Marine $29.99
  • ME Magnesium (MG) Powder - (Makes 1/2 Gallon) - Pharmaceutical Grade - MECoral
    ME Magnesium (MG) Powder - (Makes 1/2 Gallon) - Pharmaceutical Grade - MECoral $13.49
  • ReMag Magnesium Media for Calcium Reactors (8.8 lbs) -  Two Little Fishies
    ReMag Magnesium Media for Calcium Reactors (8.8 lbs) - Two Little Fishies $49.99
  • Fritz RPM Liquid Magnesium Elements (32 oz) - Fritz
    Fritz RPM Liquid Magnesium Elements (32 oz) - Fritz $22.99
  • Tech M Magnesium (64 oz.) - Kent Marine
    Tech M Magnesium (64 oz.) - Kent Marine $21.99
  • Skeletal Elements - Reef Foundation ABC+ (5 KG Bucket) -  Red Sea
    Skeletal Elements - Reef Foundation ABC+ (5 KG Bucket) - Red Sea $49.99
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