Seachem Reef Fusion 2-Part System (4 L / 1 gal) – Calcium & Alkalinity for Reef Aquariums

Reef Fusion: A two-part system for reef tanks

Reef Fusion 1 and Reef Fusion 2 form the foundation of a practical reef maintenance routine. This two-bottle approach is designed to address two core needs in many marine tanks: calcium for skeletal growth and alkalinity for buffering and carbonate availability. Used together, the system helps create a stable chemical environment that supports healthy corals and other calcareous inhabitants without requiring a complex dosing schedule.

In real-world use, hobbyists often find that keeping calcium and alkalinity on track becomes more straightforward when both parts are used as directed. Reef Fusion 1 delivers the calcium ions your corals rely on, while Reef Fusion 2 provides a blend of carbonates and bicarbonates to restore and maintain alkalinity, helping sustain the carbonate system as organisms grow.

How it works

The two parts are designed to be used in a simple 1:1 ratio, making dosing predictable and easy to manage. This straightforward approach is one of the reasons reef keepers gravitate toward Reef Fusion for steady, reliable chemistry in their tanks.

Key benefits

• Calcium content formulated for reef systems, supporting robust skeletal formation
• Alkalinity restoration and ongoing maintenance to keep the carbonate balance stable
• Concentrated two-part formulation with a simple 1:1 dosing ratio for easy use

What to expect in your aquarium

• Designed to work with a wide range of reef species that benefit from stable calcium and alkalinity
• Helps provide a balanced mineral profile, including trace elements at biologically appropriate levels
• Simple dosing routine that fits common reef-keeper workflows and reduces guesswork

By following the directed use of Reef Fusion, you can support calcium and alkalinity levels that align with typical reef environments, while maintaining a diverse and healthy mineral balance in your aquarium.