Red Sea Reef Foundation Pro Multi Test Kit (Ca, Alk, Mg)

The Red Sea Reef Foundation Pro Multi Test Kit tests the three core parameters every reef keeper needs to monitor: Calcium (Ca), Alkalinity (Alk), and Magnesium (Mg). These are the foundation elements of a healthy reef — keep them stable and in balance and your corals thrive.

Designed for precision dosing of the Red Sea Foundation A, B, and C supplements, this kit is ideal for use alongside any Red Sea 4-Part Reef Care Dosing System (Small, Medium, Large).

For coral coloration monitoring, pair with the Trace Colors PRO Multi Test Kit. Need calcium only? See the standalone Calcium Pro Test Kit.

Looking for more testing gear? Browse our Test Kits & Reagents collection.

• Tests the 3 core reef parameters: Calcium, Alkalinity, and Magnesium
• High-accuracy titration methods
• Designed for precise dosing of Red Sea Foundation A/B/C supplements
• Part of the complete Red Sea Reef Care Program
• Affordable reagent refills available

• Calcium (Ca): 400–450 ppm
• Alkalinity (Alk): 7–11 dKH (8 dKH is a common target)
• Magnesium (Mg): 1,250–1,350 ppm

Why test all three together?
Ca, Alk, and Mg are interdependent — imbalance in one affects the others. Testing together gives you a complete picture of reef chemistry.

How often should I test?
Weekly for established tanks; 2–3 times per week if you're newly dosing or running heavy coral loads.

Can I get refills?
Yes — Red Sea sells individual reagent refills so you're not buying the full kit every time.