Seachem Reef Complete Supplement
Reef Complete is a concentrated (160,000 mg/L) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in natural seawater without affecting pH. 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 Complete) and carbonates (Reef Builder or Reef Carbonate). Reef Complete 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. DO NOT OVERDOSE. Be wary of products that are milky white or need to be shaken.
- Liquid ionic calcium source
- Most concentrated calcium supplement for reef tanks
| Component | Concentration |
|---|---|
| Calcium | 160,000 mg/L |
| Magnesium | Proportional to 5% of calcium |
| Strontium | Proportional to 0.1% of calcium |
FAQ
What is the recommended dosage for Reef Complete?
Please contact customer service
Can Reef Complete be used with other calcium supplements?
Yes, Reef Complete can be used alongside other calcium supplements, but it is important to monitor total calcium levels to avoid over-supplementation.
Does Reef Complete affect the pH of the water?
No, Reef Complete is formulated to maintain calcium levels without affecting pH.

Gavin Gray –
This supplement has made a noticeable difference in my coral health. The calcium levels have stabilized and my polyps are more active than before. I use it weekly and have not had any issues with pH changes.
Simon Short –
I’ve tried several calcium supplements, but Reef Complete is the most reliable. It’s easy to measure and mixes well. My tank has been stable for over six months now.
Leah Knox –
Great product for maintaining calcium in a reef tank. The magnesium and strontium levels are balanced properly. I don’t have to adjust other supplements as much anymore.
Abigail Welch –
It works, but I found it necessary to adjust the dosage based on my tank’s readings. Not a perfect fit for all setups, but still useful.