Brightwell Aquatics Magnesion-P

Magnesium Supplement for All Marine Fish & Reef Aquaria.

  • High-purity, anhydrous powdered magnesium blend.
  • Provides magnesium, which helps regulate the balance between calcium and carbonatesin aquarium water, and is a component of aragonite, the mineral secreted by reef-building organisms to form skeletal material.
  • Contains about 300% the magnesium of almost all other dry magnesium products on the market.
  • Formulated by marine scientist.


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