Brightwell Magnesion Liquid Magnesium for Reef & Marine Aquariums (67.6 fl oz)

Premium magnesium care for reef and marine aquariums

Brightwell Aquatics Magnesion is a highly concentrated ionic magnesium solution designed for reef tanks. It helps regulate the balance between calcium and carbonates in your seawater, supporting the aragonite skeleton formation that corals, clams, and other reef inhabitants rely on. The formula is a pure magnesium delivery, free from organic additives, EDTA, gluconate, or polygluconate, prioritizing a focused nutrient profile for your aquarium.

Key benefits you can expect from Magnesion include a strong, magnesium-rich formulation that supports calcium-carbonate balance and helps prevent unwanted inorganic precipitation. The solution is developed based on empirical data and observation, emphasizing measurable dosing and monitoring over theory. In practice, magnesium plays a vital role in aragonite formation, the mineral that helps build skeletal material in reef-building organisms. This makes Magnesion a useful addition for hobbyists seeking precise magnesium management within established marine systems.

How Magnesion works in your system

• HIGH-CONCENTRATION IONIC MAGNESIUM SOLUTION—designed to maintain the proper calcium and carbonate balance in reef tanks
• REEF-BUILDING ESSENTIAL—supports aragonite skeletal material in corals and other reef inhabitants
• FREE FROM ORGANIC MATERIAL—no EDTA, gluconate, or polygluconate for a pure formula
• AMERICAN-MADE EXCELLENCE—produced in the USA with purified water and high-purity materials

Usage and dosing guidance

Before use, shake Magnesion well. For ongoing maintenance, administer 5 ml (1 capful) every other day, or as needed, to keep magnesium levels around 1,290 to 1,320 ppm in a 20-gallon aquarium. When dosed consistently, 250 ml can treat up to roughly 1,000 gallons of seawater, providing a scalable option for larger systems.

Quality you can rely on

Brightwell Aquatics prioritizes purity and observability. The Magnesion formula is grounded in empirical data and real-world measurements, ensuring a precise, effective approach to magnesium supplementation. For best results, pair Magnesion with a quality salt mix to help stabilize seawater parameters and support long-term reef vitality.

Why choose Magnesion

• Concentrated magnesium with a clear dosing target
• Free from unwanted organics and additives
• Data-driven formulation designed for aquarium observation and adjustment
• American-made quality backed by Brightwell Aquatics’ heritage in reef care