Reef Fusion 1 2 L — Ionic Calcium 100,000 mg/L 2-Part System | Seachem

Seachem Reef Fusion 1 in a 2L format is a concentrated ionic calcium supplement at 100,000 mg/L, enriched with magnesium, strontium, boron, iron, manganese, and molybdenum in biologically appropriate proportions. An integral part of the Reef Fusion system—the most concentrated 2-part system on the market—it is formulated for a 1:1 dosing ratio with Seachem Reef Fusion 2 (alkalinity). The 2L format is ideal for reef aquariums with high calcium consumption or for automated dosing with a dosing pump.

Main advantages

• Concentrated ionic calcium at 100,000 mg/L — the most concentrated 2-part system available
• Includes magnesium, strontium, boron, iron, manganese, and molybdenum in biological ratios
• Economical 2L format for aquariums with high calcium consumption
• Simple 1:1 dosing ratio with Reef Fusion 2
• Compatible with dosing pumps for automated maintenance

Use in reef aquariums

Calcium is essential for the growth of all corals, from SPS and LPS to coralline algae. Reef Fusion 1 stands out from simple calcium supplements by providing not only ionic calcium, but also trace elements that are depleted in proportion to calcium in a reef aquarium. Combined with Seachem Reef Fusion 2, it maintains the critical calcium-alkalinity balance without the accumulation of unwanted byproducts.

Dosage

• Dose every 1 to 2 days. Shake well before use.
• Add 1 ml of Reef Fusion 1 per 25 L (6.5 US gallons) in a high-current area. Wait a few minutes, then add 1 ml of Reef Fusion 2 per 25 L.
• Each dose provides 4 mg/L of calcium and 0.176 meq/L of alkalinity.
• Maintain calcium between 380 and 420 mg/L and alkalinity between 3 and 6 meq/L (8–17 dKH).
• Do not exceed 4 ml per 25 L per day.

Guaranteed analysis (per gram)

• Calcium: 95–105 mg
• Magnesium: 5 mg
• Strontium: 0.1 mg
• Boron: 0.020 mg
• Iron: 0.0005 mg
• Manganese: 0.0001 mg
• Molybdenum: 0.0005 mg
• Rubidium: 0.014 mg

Manufacturer's precautions

• Never mix Reef Fusion 1 directly with Reef Fusion 2
• Add the two products to separate locations in the aquarium.
• Make significant adjustments gradually to avoid shocking the corals and invertebrates.

Available formats

• 500 ml
• 1 L
• 2 L
• 4 L

Why choose the Reef Fusion 1 from ReefSolution?

For complete dosing, combine Seachem Reef Fusion 1 2L with Seachem Reef Fusion 2 2L in a 1:1 ratio. Automate your routine with the Kamoer X1 Pro Dosing Pump and check your parameters with the Salifert Calcium Test Kit or the Hanna Checker Calcium for precise reef calcium maintenance.

Frequently Asked Questions

What is the difference between the Reef Fusion 1 and the Reef Complete?

Both are Seachem ionic calcium supplements. Reef Fusion 1 is designed as a 2-part system with Fusion 2 in a 1:1 ratio, at 100,000 mg/L of calcium. Reef Complete is a standalone supplement at 160,000 mg/L of calcium, more concentrated but without the integrated ratio system.

Is the Reef Fusion 1 compatible with dosing pumps?

Yes. The product is liquid and compatible with dosing pumps. Shake well before filling the reservoir. Never mix Fusion 1 and Fusion 2 in the same dosing container.

Is the 2L size advantageous for large SPS aquariums?

Yes. The 2L format offers better value for money for systems with high calcium consumption, especially tanks dominated by SPS corals with automated daily dosing.