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Brightwell – Magnesion

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Concentrated Magnesium Supplement for All Marine Fish & Reef Aquaria


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  • Highly-concentrated ionic magnesium solution.
  • Provides magnesium, which helps regulate the balance between calcium and
    carbonates in aquarium water, and is a component of aragonite, the mineral
    secreted by reef-building organisms such as corals, clams, and their allies to
    form skeletal material.
  • Stronger than most competing products.
  • Contains no unwanted organic material such as EDTA, gluconate, or polygluconate.
  • Formulated by a marine scientist.
  • For complete information, click the ‘Technical’ button at the top right.



250ml | 500ml | 2L | 20L


2 L / 67.6 fl. oz., 250ml / 8.5 fl. oz, 500ml / 17 fl. oz