The Seachem Reef Reactor MD 20L is a premium, high-purity aragonite source specifically designed for use in saltwater aquarium calcium reactors. It effectively supplies all critical elements necessary for maintaining optimal ionic balance, promoting robust coral growth, and enhancing vibrant coloration within reef aquaria. As it slowly dissolves with the addition of CO2, it continuously provides essential building blocks for a thriving reef ecosystem.

With a precise grain size of approximately 0.5-1 cm, this media is engineered for steady dissolution, releasing vital calcium, magnesium, strontium, potassium, and various other essential carbonates. It excels at increasing and stabilizing alkalinity, which in turn supports a stable pH and encourages the rapid formation of coral skeletal material. Notably, it boasts the highest level of soluble potassium among competing brands while exhibiting the lowest levels of both aluminum and phosphorus, ensuring clean and balanced supplementation.

This product is an excellent choice for serious reef aquarists utilizing calcium reactors who are focused on achieving rapid growth and propagation of corals and other calcareous animals. Its balanced supplementation of high calcium and magnesium, combined with its purity, makes it ideal for maintaining a thriving, stable reef environment where precise parameter control and long-term success are paramount.