Red Sea Reef Foundation A — Calcium+ (500 mL / 16.9 fl. oz.)
Transform Your Tank with Balanced Calcium for Stronger Coral Growth
Looking for a precision-formulated calcium supplement that does more than just raise numbers? Red Sea Reef Foundation A Calcium+ is a hobbyist staple at The Coral Boutique, trusted by reef keepers who understand that strong, vibrant corals start with balanced foundation chemistry. This 500 mL bottle is sized perfectly for nano and mid-sized reef systems running manual or automated dosing.
Reef Foundation A is a high-purity liquid blend of calcium and strontium salts (with trace barium) formulated in the exact biological ratio found in coral skeletons. Calcium is a foundation building block — corals, clams, and coralline algae depend on it daily to construct healthy skeletal structures, and stable levels are critical for SPS, LPS, and softies alike. Red Sea recommends maintaining calcium between 410–465 ppm, with the lower end (410–430 ppm) often producing the best coral coloration. Reef Foundation A is part of Red Sea's complete Reef Care Program, designed to be dosed alongside Foundation B (Alkalinity) and Foundation C (Magnesium) to keep your three core parameters in true balance. Ready-to-use straight from the bottle — no mixing, no stock solutions — it works equally well with manual dosing or a dosing pump for rock-solid stability.
Key Benefits
- High-purity liquid calcium and strontium complex in seawater-correct ratios
- Promotes strong, healthy coral skeletal growth across SPS, LPS, and softies
- Supports vibrant coral coloration when paired with stable calcium parameters
- Ready-to-use formula — no mixing required, no stock solution needed
- Ideal for both manual dosing and automatic dosing pumps
- Part of the complete Red Sea Reef Care Program for balanced reef chemistry
- Concentrated formulation — efficient dosing for nano and mid-sized reefs
Quick Stats & Dosing Guide Product Name: Red Sea Reef Foundation A — Calcium+ Manufacturer: Red Sea Size: 500 mL (16.9 fl. oz.) Active Ingredients: Calcium chloride, strontium, barium (in coral-skeleton ratios) Form: Ready-to-use liquid supplement Target Calcium Range: 410–465 ppm (best coloration around 410–430 ppm) Dosing Rate: 1 mL raises Ca by 2 ppm in 100 liters (25 gallons) Recommended For: Reef aquariums up to 500 liters (125 gallons) Best Practice: Dose according to measured calcium uptake using Red Sea's Foundation Pro multi-test kit Compatibility: Works alongside Reef Foundation B (Alkalinity / KH) and Reef Foundation C (Magnesium) for complete balance Best For: Reef keepers running mixed reefs, SPS-dominant systems, or any saltwater aquarium where precise calcium control matters Directions: Test calcium levels regularly. Add directly to a high-flow area of the sump or display, or use with a dosing pump. Always dose Foundation A and B with at least 30 minutes between doses to avoid precipitation.
Why Buy From The Coral Boutique?
At The Coral Boutique, we stock only the supplements and additives we trust on our own systems. Red Sea's Reef Foundation A Calcium+ is a long-standing favorite in the saltwater aquarium hobby because it delivers consistent, predictable results — the kind of stability that grows healthier corals over the long haul. Every product on our shelves is tested, vetted, and backed by reefers who actually use it — so you can buy with confidence.
