--- product_id: 1627406 title: "Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums" brand: "red sea" price: "S$70" currency: SGD in_stock: true url: https://www.desertcart.sg/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium store_origin: SG region: Singapore --- # Part of balanced 3-step reef care system Calcium & Strontium blend for coral skeletons Precise dosing: 1mL/25 gallons = +2 ppm Ca Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums **Brand:** red sea **Price:** S$70 **Availability:** βœ… In Stock ## Summary > 🌊 Elevate Your Reef Game β€” Because Your Corals Deserve the Best ## Quick Answers - **What is this?** Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums by red sea - **How much does it cost?** S$70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium) ## Best For - red sea enthusiasts ## Why This Product - Trusted red sea brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact Powerhouse:** 500ml bottle packs a potent punch for long-term coral vitality - β€’ **Trusted by Reef Pros:** Backed by 250+ rave reviews and Red Sea’s marine expertise - β€’ **Synergize Your Reef Care:** Works seamlessly with Foundation B & C for a perfectly balanced marine ecosystem - β€’ **Sculpt Your Reef’s Future:** Optimized Ca/Sr ratio fuels robust coral skeleton growth - β€’ **Precision Dosing, Zero Guesswork:** Easy liquid formula lets you control calcium levels with surgical accuracy ## Overview Red Sea Reef Foundation A is a premium liquid supplement delivering a scientifically balanced blend of calcium and strontium to promote healthy coral skeleton formation. Designed for easy dosing at 1mL per 25 gallons to raise calcium by 2 ppm, it integrates perfectly with Red Sea’s Reef Care Program (Foundation B & C) to maintain a stable, thriving marine aquarium environment. ## Description desertcart.com : Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums : Petsuppliesmisc : Pet Supplies ## Features - Supports Coral Skeleton Formation: Red Sea Reef Foundation A provides a blended supplement of calcium and strontium in the correct ratios to encourage and support the healthy growth and development of coral skeletons. - Part of a Complete Program: This supplement is a key component of the comprehensive Red Sea Reef Care Program, designed to work in conjunction with Foundation B (Alkalinity) and Foundation C (Magnesium) for a balanced and stable reef environment. - Easy to Dose and Maintain: The liquid formula is easy to dose, allowing for precise control of calcium levels. The recommended dosage is 1mL per 25 gallons of water to raise the calcium level by 2 ppm, making it simple to maintain optimal conditions for your corals. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004E47QSC | | Best Sellers Rank | #144,842 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,275 in Aquarium Water Treatments | | Brand | Red Sea | | Brand Name | Red Sea | | Customer Reviews | 4.8 out of 5 stars 250 Reviews | | Global Trade Identification Number | 00730773220137 | | Item Form | Liquid | | Item Weight | 0.77 Kilograms | | Liquid Volume | 500 Milliliters | | Manufacturer | Red Sea | | Manufacturer Part Number | Red Sea Reef Foundation A Supplement (Ca | | Model Number | Red Sea Reef Foundation A Supplement (Ca | | Target Species | Coral | | UPC | 730773220137 | | Unit Count | 16.9 Fluid Ounces | ## Product Details - **Brand:** Red Sea - **Item Form:** Liquid - **Item Weight:** 0.77 Kilograms - **Liquid Volume:** 500 Milliliters - **Manufacturer:** Red Sea ## Images ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 1](https://m.media-amazon.com/images/I/81c7ZUzhmFL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 2](https://m.media-amazon.com/images/I/51FUuu6hZEL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 3](https://m.media-amazon.com/images/I/819bAaLQeGL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 4](https://m.media-amazon.com/images/I/61doThkf+vL.jpg) ![Red Sea Reef Foundation A (Ca/Sr) Supplement, 500ml - Calcium & Strontium Additive for Healthy Coral Growth in Marine & Reef Aquariums - Image 5](https://m.media-amazon.com/images/I/813S2x5uOnL.jpg) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium](https://www.desertcart.sg/products/1627406-red-sea-reef-foundation-a-ca-sr-supplement-500ml-calcium) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-07-21*