Red Sea 4-Part Complete Reef Care
The Red Sea 4-Part Complete Reef Care program delivers a streamlined, research-driven approach to reef chemistry, giving hobbyists optimal coral growth, vivid colouration and unmatched convenience. Formulated for reef systems without refugiums, this four-part system replaces the traditional seven-part method by using Red Sea’s proven fixed-ratio chemistry — meaning all components are consumed proportionally and replenished together. With only a single weekly calcium test guiding the dose for all four parts, reefkeeping becomes faster, simpler and more precise for every aquarist.
Key Benefits
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One weekly test determines all 4 part doses
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Fixed-ratio formulation replaces a full 7-part program with no loss in performance
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Supports maximal coral growth through balanced Major, Minor & Trace elements
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Perfectly stable chemistry when paired with ReefDose automation
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No additional cost compared to the previous program
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Designed specifically for systems without refugiums
Core Features
Scientifically Optimised Formula
Decades of research have shown that in typical reef systems without refugium, Major, Minor, Trace and Alkalinity components are consumed in a stable, predictable ratio — allowing a reliable four-part replenishment schedule.
Calcium-Driven Dosing Logic
Calcium uptake is the most accurate indicator of calcification and coral growth. Your weekly Ca measurement determines all four solution doses, simplifying reef chemistry to its essentials.
Identical Results to the Original 7-Part System
With the same chemical balance as Red Sea’s full RCP, the 4-part kit maintains identical coral health and colouration — now with less testing and fewer bottles.
ReefDose Compatible for Full Automation
Pairing with the Red Sea ReefDose makes dosing fully automated and self-balancing:
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Set your calcium dose once
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ReefDose automatically adjusts all other parts accordingly
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Zero weekly programming required
Three Sizes Available
Designed to suit nano tanks, mid-sized reefs and large systems with equal precision.
Technical Specifications
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System Type: Designed for reef aquariums without refugium
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Dosing Method: Single weekly Calcium test determines all 4 part dosages
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Chemical Composition: Identical to Red Sea’s 7-Part RCP
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Compatibility: Can be automated via Red Sea ReefDose
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Available Sizes: Three package sizes for different aquarium volumes
Who Is This Product For?
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Reefkeepers wanting maximum coral growth and colour with minimal testing
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Aquarists running non-refugium systems
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Hobbyists upgrading from the original 7-part RCP
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Anyone seeking a simplified, highly accurate dosing system
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ReefDose users who want hands-off, balanced automatic dosing
