Description
Red Sea Reef Foundation ABC+ 1kg — All-in-one calcium, alkalinity and magnesium powder
Three dosing bottles is one routine more than some reef keepers want, and a single powder carrying all the foundation elements in fixed proportion is the alternative. Red Sea Reef Foundation ABC+ Powder 1kg (SKU: RED300) is Red Sea’s combined foundation supplement, a powder that replenishes calcium, alkalinity and magnesium in the ratio found in coral skeleton, together with strontium, potassium, bromine and iodine. It is for aquariums with balanced consumption of all three elements, where testing shows calcium, alkalinity and magnesium used in the same proportion, so one addition replaces all of them. Red Sea states that 1 g raises the calcium level of 100 L by 1.5 ppm.
Red Sea’s approach is to dose the powder daily or weekly according to the aquarium type and a measured uptake of calcium, with the other elements following in their fixed ratio. When dosing daily, all of the foundation elements are tested weekly and any drift is corrected with the individual Foundation A, B or C supplements; when dosing weekly, testing is monthly. The powder is dissolved in water before it is added so it disperses without settling on rock or sand. A kilogram is a large quantity at home-reef rates, so the tub suits mid-size and larger systems and keepers who prefer one powder to three lines.
Usage & Application
When to Use
- Balanced consumption: Aquariums where calcium, alkalinity and magnesium fall together in proportion.
- Single-supplement routine: One powder in place of three separate bottles and three dose points.
- Weekly dosing: Systems maintained with one measured weekly addition and a monthly test.
- Reef Care Program users: The combined option within the Foundation series.
Dosing & Administration Guide
- Measure calcium uptake: Test over a week to find the daily or weekly draw.
- Weigh the powder: 1 g per 100 L raises calcium by 1.5 ppm; dose to replace the measured draw.
- Dissolve first: Mix into water and add to a high-flow area.
- Test and trim: Weekly on daily dosing, monthly on weekly dosing; correct any single element with Foundation A, B or C.
Product Specifications & Highlights
Key Features
- Calcium, alkalinity and magnesium together: In the ratio found in coral skeleton.
- Plus trace elements: Strontium, potassium, bromine and iodine.
- Measured effect: 1 g per 100 L raises calcium by 1.5 ppm.
- Daily or weekly dosing: Set by the aquarium’s measured uptake.
- 1 kg powder: For mid-size and larger reefs.
Product Details
- Brand: Red Sea
- SKU: RED300
- Barcode (GTIN/EAN): 7290100772140
- Product Type: Additives & Supplements > Reef Foundation Elements
- Net Weight: 1 kg powder
- Composition: Calcium, magnesium, strontium and carbonate with potassium, bromine and iodine
- Effect: 1 g per 100 L raises calcium by 1.5 ppm, with alkalinity and magnesium in fixed ratio
- Dosing: Daily or weekly according to measured calcium uptake
- Testing: Weekly with daily dosing; monthly with weekly dosing
- Preparation: Dissolve in water before adding to a high-flow area
- Range Sizes: 1 kg and 5 kg
- Target Environment: Marine reef aquariums with balanced foundation-element consumption


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