Red Sea Reef Aquarium Magnesium Supplement, 1 L Liquid for Coral Skeleton Support

Red Sea Reef Foundation C is a liquid magnesium supplement for marine and reef aquariums, designed to support balanced coral skeleton formation, with a 1-liter volume and a concentration of 1 ml per 100 liters (25 gal) for a 1 ppm increase.

• Made for magnesium balance in marine and reef aquariums — supports balanced formation of coral skeletons.
• Part of Red Sea’s complete Reef Care program — designed to be used alongside Reef Foundation A and B.
• Liquid formula in a 1-liter container — provides a ready-to-dose magnesium supplement.
• Dosing based on measured magnesium uptake — helps tailor addition to the aquarium’s observed use.

Maintaining magnesium balance is part of managing a reef aquarium where corals form skeletons. Reef Foundation C is made for aquarists who want a magnesium supplement that fits into a coordinated reef-care routine. Its concentration gives a defined relationship between the amount added and the magnesium level change, while measured uptake provides the basis for deciding how much to dose.

What is Reef Foundation C used for?

It is a magnesium complex intended to support balanced formation of coral skeletons in marine and reef aquariums. The formula contains blended magnesium salts and is one component of Red Sea’s complete Reef Care program. It is intended to work in conjunction with Reef Foundation A and Reef Foundation B as part of that program.

• Product type: liquid magnesium complex.
• Purpose: support balanced coral skeleton formation.

How much does the magnesium level change per dose?

One milliliter raises the magnesium level of 100 liters (25 gal) by 1 ppm. Dose according to measured magnesium uptake, rather than using the concentration as a fixed schedule; the amount needed depends on the uptake you measure in your aquarium.

• Use the stated concentration to relate dose volume to the specified water volume and level change.
• Red Sea Magnesium Pro Aquarium Test Kit may be useful for measuring magnesium.

What comes in the container, and how does it fit a reef-care routine?

The product is a 1-liter (1000 ml) liquid supplement. Its role in the Reef Care program is specifically magnesium support, so it can be paired with Foundation A and Foundation B as directed by measured uptake. The product details provide a concentration for dosing but do not give a separate dosing frequency.

• Container volume: 1 liter (1000 ml).
• Recommended approach: base dosing on measured magnesium uptake.

Reef Foundation C suits marine and reef aquarium keepers who want a measured magnesium supplement as part of Red Sea’s Reef Care program, particularly when maintaining balanced coral skeleton formation is a goal. Its stated dose concentration and uptake-based dosing approach make its role clear: it supplies magnesium in a defined liquid format for reef aquarium care.