Brightwell Aquatics 500-ml. Magnesion Liquid Magnesium Supplement
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
Basic Instructions: Shake product well before using. Add 5 ml (1 capful) of product per 20 US-gallons of aquarium water every other day or as needed to maintain the magnesium concentration within a range of 1,290 - 1,320 ppm. When used in this fashion, 250 ml treats up to 1,000 US-gallons (3,785 L).