Red Sea NO3:PO4-X is a complete biological reduction solution for controlling nitrates and phosphates in reef and marine aquariums. This carbon-source blend feeds naturally occurring nutrient-reducing bacteria, allowing you to manage nuisance algae and dial in healthier corals without constant water changes.
Looking for more reef chemistry? Browse our Water Treatments.
Features
- Reduces and maintains NO3 (nitrate) and PO4 (phosphate) in reef tanks
- Complex carbon blend promotes beneficial nutrient-reducing bacteria
- Part of the Red Sea Algae Management Program
- 100% reef safe when dosed correctly — do not overdose
- 500 ml / 16 oz bottle — treats a large volume over months
Specifications
| Brand | Red Sea |
| Product | NO3:PO4-X NOPOX Nitrate & Phosphate Reducer |
| Size/Volume | 500 ml / 16 oz |
| Suitable For | Saltwater / Reef |
| Dosage | 1 ml per 25 gallons daily (consult label for ramp-up schedule) |
| UPC | 730773222032 |
| Condition | New |
FAQ
How much should I dose?
Start low — 1 ml per 25 gallons daily — and adjust gradually based on NO3 and PO4 test results. Red Sea’s label includes a ramp-up schedule to avoid shocking the system.
Is this reef safe?
Yes, NO3:PO4-X is 100% reef safe at proper dosing. Overdosing can cause bacterial blooms, cloudy water, and oxygen depletion — always test before increasing dose.
Do I need a protein skimmer?
A protein skimmer is strongly recommended. NOPOX feeds bacteria that are then exported through skimming, which is how nutrients actually leave the tank.
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