Seachem Reef Advantage Magnesium™

Seachem Reef Advantage Magnesium is a concentrated dry magnesium supplement, the element that lets a reef tank hold calcium and alkalinity where you set them.

Key features

• Raises magnesium toward natural seawater levels
• Lets calcium and alkalinity stay stable together
• Concentrated dry blend, dosed to a test

Correct magnesium here when a test shows it low, which often unlocks stubborn calcium and alkalinity readings. Part of our water care. Available for local pickup at our Lethbridge store.