Which Seatorch Calcium Reactor Is Right Size for Your Reef Tank?

Which Seatorch Calcium Reactor Is Right for Your Reef Tank?

Choosing the correct calcium reactor is essential for maintaining stable calcium and alkalinity levels in a healthy reef aquarium. The new generation of Seatorch calcium reactors are available in four sizes, making it easy to match the perfect reactor to your aquarium’s needs.

SM-40X — Compact & Efficient

Perfect for nano and small reef systems from 100–500L (26–132 gallons).
A great choice for mixed reefs, soft coral tanks, and hobbyists looking for a compact reactor with excellent efficiency.

SM-60X — The All-Rounder

Designed for aquariums up to 1000L (264 gallons).
Ideal for medium-sized mixed reefs and growing SPS systems that require stable calcium delivery and longer media life.

SM-80X — Built for Serious SPS Reefs

Suitable for larger reef systems from 700–1300L (184–343 gallons).
With increased media capacity and stronger circulation, the SM-80X is designed for high-demand SPS-dominated aquariums.

SM-120X — Maximum Performance

Engineered for large reef aquariums up to 2000L (528 gallons).
Perfect for heavily stocked SPS systems, coral farms, and advanced reef keepers who require maximum stability and performance.

Optional Additional Chamber Upgrade

For reef keepers with extremely high calcium demand, Seatorch also offers an optional add-on secondary chamber to further increase media capacity and reactor efficiency.

Benefits of the additional chamber include:

• Extended media capacity
• Longer maintenance intervals
• Improved CO₂ efficiency
• Enhanced pH stability
• Better support for heavily stocked SPS systems

This upgrade is ideal for advanced reef aquariums, coral propagation systems, and rapidly growing SPS-dominated tanks that require maximum reactor performance.

Which Size Should You Choose?

When selecting a calcium reactor, consider:

• Total water volume
• Coral density
• Future coral growth
• Calcium and alkalinity consumption

For best long-term performance, we generally recommend choosing slightly larger if your reef is SPS-heavy or rapidly growing.

With Seatorch’s advanced dual-chamber design and instant gas-water mixing technology, every model is built to deliver efficient CO₂ usage, stable reactor performance, and easier reef maintenance.