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- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 11 - Jul 16
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Description
Seachem Laboratories Reef Advantage Calcium SupplementReef Advantage Calcium 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. To prevent this you must provide calcium (Reef Advantage Calcium) and carbonates (Reef Builder or Reef Carbonate). Reef Advantage
Reef Advantage Calcium 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. To prevent this you must provide calcium (Reef Advantage Calcium) and carbonates (Reef Builder or Reef Carbonate). Reef Advantage Calcium also includes magnesium and strontium in amounts proportionate to typical utilization ratios (100:5:0.1, Ca:Mg:Sr). This allows one to maintain these two important elements while maintaining calcium. 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. DO NOT OVERDOSE: Excess calcium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if calcium & carbonate additives are added on alternate days or at least 30 minutes apart. Guaranteed Analysis: Calcium (Ca) 34.7%; Magnesium (Mg) 1.73%; Strontium (Sr) 0.0346%Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
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Product Reviews
★★★★★ 5
Wrinkle Free!
Color: Navy Blue Square, Size: X-Large
Love this shirt. Comfortable, looks great and best of all, it doesn’t require any ironing!
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Quality
Love the fit, color, and softness. Looks sharp on my husband. Going to buy more colors
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Reviewed in the United States on September 13, 2025
★★★★★ 5
Great shirt!
Color: Light Green-flower, Size: 3X-Large
Good quality shirt!
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Reviewed in the United States on April 17, 2026
★★★★★ 4
Looks great
Looks and fits great true to size
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Reviewed in the United States on February 5, 2026
★★★★★ 3
Extra extra small
Color: A-black, Size: XX-Large
Sizing is considerably off. I ordered a 2X for my 6’4” husband based on the measurement chart. Based on the way it fit I don’t think a 3X would fit. Fortunately a teenager in the family can wear it.
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Reviewed in the United States on January 24, 2026