Brightwell Aquatics Magnesion-P - Magnesium Powder Supplement for Marine &amp Reef Aquariums 800g

- Provides magnesium which helps regulate the balance between calcium & carbonates in aquarium water - Component of aragonite, which is secreted to form skeletal materials for corals, clams, and their allies - Contains no unwanted organic material such as EDTA, gluconate, or polygluconate - Made in the USA

From the manufacturer