Red Sea Reef Foundation A, B, C is a complete three-part dosing system designed to maintain the core water chemistry parameters every reef tank depends on: calcium, alkalinity, and magnesium. Rather than relying on a single two-part solution or calcium reactor alone, the Reef Foundation system gives you independent control over each parameter so you can dial in and hold the precise balance your corals need to build skeleton, maintain tissue integrity, and grow with consistency.
Each component works as part of a balanced system. Foundation A supplies calcium, Foundation B maintains alkalinity and carbonate levels, and Foundation C addresses magnesium — the often-overlooked parameter that underpins both calcium and alkalinity stability. Using all three together is what makes the system effective.
Why we love it
- Independent control over calcium, alkalinity, and magnesium without parameters pulling each other out of balance
- Highly concentrated formula — a little goes a long way, especially in smaller systems
- Predictable and clean — mixes clear and doses without clouding the water
- A natural starting point for reefers transitioning away from kalkwasser or two-part into a more structured dosing routine
- Compatible with manual dosing or any standard dosing pump
Recommended daily dosage
Dose per 100 L (25 gal) to raise each parameter by approximately 1 unit. Adjust based on coral consumption and regular testing:
| Component |
Raises |
Dose per 100 L |
| Foundation A |
Calcium ~8 ppm |
1 mL |
| Foundation B |
Alkalinity ~0.36 dKH |
1 mL |
| Foundation C |
Magnesium ~4 ppm |
1 mL |
Start low, test every few days, and increase dose incrementally as needed.
How to use
Dose each component separately, ideally at different times of day to avoid interaction in the water column. Add directly to a high-flow area of the sump, or dose via a dosing pump on a timed schedule. Always test calcium, alkalinity, and magnesium before starting, and retest after the first week to establish your tank's actual consumption rate before increasing doses.
Storage
Store in a cool, dry place away from direct sunlight. Keep lids tightly sealed between uses. No refrigeration required.
What's in the box
- 1 x Red Sea Reef Foundation A – 250 mL (Calcium)
- 1 x Red Sea Reef Foundation B – 250 mL (Alkalinity/Buffer)
- 1 x Red Sea Reef Foundation C – 250 mL (Magnesium)
