Description
Red Sea Reef Care NO3:PO4-X Nitrate and Phosphate Reducer 1ltr — Litre of NOPOX for daily carbon dosing on mid-size reefs
At 2 mL per 100 L a day, a 300 L reef uses 6 mL daily, so a 500 mL bottle is a three-month purchase and the litre is the practical size. Red Sea Reef Care Nitrate No3 And Phosphate Po4 Reducer 1ltr (SKU: RED290) is the 1 L bottle of NO3:PO4-X, the nutrient-control product in Red Sea’s Reef Care Program, a complex of different carbon molecules and organically bonded elements that boosts the nitrate- and phosphate-reducing bacteria already present in the aquarium. Red Sea describes it as reef safe with no undesirable side effects, setting and maintaining the nitrate and phosphate levels the keeper wants.
The product is formulated for daily dosing by pump into the sump and relies on an efficient protein skimmer to export bacterial flocs and keep oxygen up. Starting doses per 100 L come from the nitrate test, 3 mL above 10 ppm, 2 mL from 2.5 to 10 ppm and 1 mL from 1 to 2.5 ppm in a mixed reef, where Red Sea’s targets are 1 to 2 ppm nitrate and 0.08 to 0.12 ppm phosphate. The dose is halved when nitrate drops under 1 ppm, and missed doses are skipped rather than doubled.
Usage & Application
When to Use
- Reefs of 200 to 500 litres: A litre covers months of daily dosing at 2 mL per 100 L.
- Dosing pumps: Fill the reservoir from one bottle for the nutrient channel.
- Algae control: Lowering the nitrate and phosphate that drive nuisance algae.
- Coloration programs: Holding low nutrients alongside Trace Colours dosing.
Dosing & Administration Guide
- Set the start dose: From the nitrate reading, 1 to 3 mL per 100 L daily; SPS and ULNS tanks also read phosphate.
- Daily by pump: Into the sump, with the skimmer running at full output.
- Adjust from tests: Weekly, then twice weekly once stable; halve the dose below 1 ppm nitrate.
- Keep it simple: No sulphur denitrators or removal media alongside; skip rather than make up missed doses.
Product Specifications & Highlights
Key Features
- 1 L bottle: About 160 days on a 300 L reef at 2 mL per 100 L.
- Multi-carbon complex: Feeds several strains of nutrient-reducing bacteria.
- Sets and maintains levels: Dose adjusted to the keeper’s nitrate and phosphate targets.
- Reef safe: No undesirable side effects at the recommended dose, per Red Sea.
- Program product: Works with the Trace Colours and Foundation lines.
Product Details
- Brand: Red Sea
- SKU: RED290
- Barcode (GTIN/EAN): 7290100772959
- Product Type: Additives & Supplements > Nitrate & Phosphate Reducer
- Net Volume: 1 L
- Composition: Complex of carbon molecules and organically bonded elements (contains ethanol)
- Starting Dose: 1–3 mL per 100 L per day by nitrate level
- Program Targets: Mixed reef nitrate 1–2 ppm, phosphate 0.08–0.12 ppm
- Requirement: Efficient protein skimmer
- Not Used With: Sulphur denitrators, nitrate or phosphate removal media
- Range Sizes: 100 mL, 500 mL (RED289), 1 L, 5 L (RED289a)
- Target Environment: Marine reef and fish aquariums with a protein skimmer


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