Product Overview
Seachem Reef Fusion 1 is a concentrated ionic calcium supplement designed for reef aquariums. It is part of a two-part system, used in conjunction with Reef Fusion 2, to maintain essential calcium and alkalinity levels necessary for healthy coral growth. Reef Fusion 1 also provides biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum.

Image: Front view of the Seachem Reef Fusion 1, 4-liter bottle. The label clearly shows "Reef Fusion 1" and indicates it's a "Two-Part System" that "Maintains Calcium & Alkalinity Levels" and "Raises Calcium."
Important Safety Information
- Keep out of reach of children.
- For aquarium use only.
- Never mix Reef Fusion 1 with Reef Fusion 2 directly.
- Store in a cool, dry place.
Usage Instructions
Dosing Procedure:
- Shake well before using.
- Add 1 mL of Reef Fusion 1 per 25 L (6.5 US gallons) of water. The cap holds 5 mL for reference.
- Add Reef Fusion 1 to a high current area of the tank.
- Wait a few minutes.
- After shaking well, add Reef Fusion 2 in the same manner: 1 mL per 25 L (6.5 US gallons).
- It is recommended to add the two products to separate locations in the tank.
- Dose aquarium every 1-2 days.
This dose contributes approximately 4 mg/L of calcium and 0.176 meq/L of alkalinity.
Important Dosing Notes:
- Maintain calcium levels between 380-420 mg/L.
- Maintain alkalinity between 3-6 meq/L.
- The size or frequency of the dose may be increased if the current regimen is insufficient to maintain calcium and alkalinity within these ranges.
- Do not exceed 4 mL per 25 L (6.5 US gallons) per day for either product.

Image: Seachem Reef Fusion 1 Dosing Table, showing recommended doses in mL, capfuls, and drops for various water volumes (1 quart to 50 gallons).
Maintenance
Regular monitoring of calcium and alkalinity levels in your reef aquarium is crucial. Use a reliable test kit to check these parameters frequently, especially after initial dosing adjustments. Consistent dosing according to the instructions will help maintain a stable environment for your corals.
Troubleshooting
Low Calcium/Alkalinity Levels:
If your calcium or alkalinity levels remain below the recommended ranges (380-420 mg/L for calcium, 3-6 meq/L for alkalinity) despite regular dosing, you may need to increase the dose frequency or amount. However, do not exceed 4 mL per 25 L (6.5 US gallons) per day for either Reef Fusion 1 or Reef Fusion 2.
High Calcium/Alkalinity Levels:
If levels are consistently above the recommended ranges, reduce the dosing frequency or amount. Overdosing can lead to precipitation and negatively impact water quality.
Always re-test water parameters after making adjustments to your dosing regimen.
Specifications
| Feature | Detail |
|---|---|
| Brand | Seachem |
| Model Number | 1209 |
| Liquid Volume | 4 Liters (1.1 US Gallons) |
| Item Form | Liquid |
| Item Weight | 9.04 Pounds |
| Product Dimensions (LxWxH) | 4.5 x 6.88 x 11.5 inches |
| Manufacturer | Seachem Laboratories, Inc. |
Guaranteed Analysis (Amounts per 1 g):

Image: Back label of Seachem Reef Fusion 1 bottle, displaying detailed guaranteed analysis of elements per 1 gram of product, including Calcium, Magnesium, Strontium, Boron, Iron, Manganese, Molybdenum, and Rubidium.
- Calcium (Ca) (min): 95 mg
- Calcium (Ca) (max): 105 mg
- Magnesium (Mg) (min): 5 mg
- Strontium (Sr) (min): 0.1 mg
- Boron (B): 0.020 mg
- Iron (Fe): 0.0005 mg
- Manganese (Mn): 0.0001 mg
- Molybdenum (Mo): 0.0005 mg
- Rubidium (Rb): 0.014 mg
Warranty Information
This product is covered by the manufacturer's warranty as labeled. For specific details regarding warranty coverage and claims, please refer to the product packaging or contact Seachem Laboratories, Inc. directly.
Customer Support
For further assistance, questions, or technical support regarding Seachem Reef Fusion 1, please visit the official Seachem website or contact their customer service department. Contact information can typically be found on the product packaging or their website.