Check the listing for details. ASF Reef Shots Magnesium - 24 Shots. Condition: New. Listed at 19.99 USD. It is also used in the formation of the skeletons of reef organisms. Instructions : Shake well before using. Standard dose: 1 vial per 200 litres (50 gallons) of seawater per week. Dose to increase concentration: 1 vial per 100 litres (25 gallons) of seawater.
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