Red Sea – NO3:PO4-X (Nitrate & Phosphate Reducer)
Biological Nutrient Control for Reef Aquariums
NO3:PO4-X is Red Sea’s reef-safe solution for reducing and maintaining low nitrate & phosphate levels to help prevent nuisance algae and support healthy coral coloration and growth. It promotes the natural proliferation of nutrient-reducing bacteria already present in your system by supplying a unique complex of carbon sources tailored to support multiple strains of microbial life.
Available Sizes:
- 500 mL
- 1000 mL
- 5000 mL
Key Benefits:
- Effectively reduces & maintains nitrate and phosphate
- 100% reef safe when used as directed
- Supports long-term algae control
- Promotes a healthy, stable nutrient export system
- Ideal for both mixed reefs and SPS-dominant systems
- Cost-effective & easy to use
Usage Notes:
- Always begin with half the recommended dose to acclimate your system.
- Use reliable nitrate & phosphate test kits to monitor nutrient levels.
- Daily dosing is essential for best results—use a dosing pump for accuracy.
- Avoid overdosing—NO3:PO4-X is concentrated and potent.
Recommended Daily Dosage:
| Aquarium Type | Target NO3 | Target PO4 | Daily Dose (per 25 gal) |
| Mixed Reef / SPS Frags | 1–2 ppm | 0.08–0.12 ppm | 2 mL |
| SPS Dominant | 0.25–0.5 ppm | 0.01–0.02 ppm | 1–2 mL |
| Ultra Low Nutrient SPS | 0 ppm | 0 ppm | 1–2 mL |
| Marine Fish Only | <10 ppm | <1 ppm | 3 mL |
Part of Red Sea’s Algae Management Program, NO3:PO4-X offers a controlled, biological approach to nutrient export—without chemical additives or harsh treatments.
We totally understand that plans change! You can modify or cancel your order as long as it hasn’t been shipped yet. Just call or email us right away - our team will confirm if we can catch it before it leaves our facility.
If your order is already in transit, you’ll need to request a return once it arrives. Keep in mind that some items, like aquariums and livestock, can’t be returned.
For full terms, please refer to our Refund & Return Policy.
Placing an order is simple - just add your item to the cart & complete the checkout process online. Once your order is confirmed, we'll reach out to you directly to schedule a local pick-up appointment at our facility.
* All local pick-ups are by appointment only *
Order processing typically takes 1-2 business days for products that are in stock or readily available through our network of distributors. Some products, however, are fulfilled on demand directly from our distributors, which can slightly extend processing and delivery times depending on availability and location.
Rest assured - we always work to get your order shipped as quickly as possible.
If you’d like to confirm availability or request an ETA before placing your order, you’re always welcome to call or email us.