Red Sea Nutrients Control Multi Test Kit (NO3/PO4)
Pack size
100 nitrate tests + 100 phosphate tests
Water type
Saltwater + Reef
Part no.
RED259
Red Sea Nutrients Control Multi Test Kit (NO3/PO4)
Both nutrient numbers in one kit, at reef-tank resolution. The Red Sea Nutrients Control Multi Test Kit measures nitrate and phosphate together — the pair that between them decide coral colour, growth, and whether nuisance algae gets a foothold. It's a colorimetric comparator kit: dose the reagents, match the colour against the printed reference card, and read the result. No titration, no meter to calibrate.
Key features
- Tests nitrate and phosphate in one box — 100 tests for each parameter, so you're not buying and tracking two separate kits.
- Reef-relevant range — nitrate 0–64 ppm and phosphate 0–5 ppm, covering everything from a heavily stocked fish-only tank down to a low-nutrient reef.
- Fine enough resolution for reef dosing decisions — nitrate to 0.125 ppm, phosphate to 0.02 ppm.
- Comparator format — no titration technique to learn, no drop-counting errors; read the colour against the card.
- Built for Red Sea's Reef Care Program — the same nitrate and phosphate numbers this kit reads are what the NO3:PO4-X dosing chart is based on.
Specifications
| Spec | Red Sea Nutrients Control Multi Test Kit |
|---|---|
| SKU | RED259 |
| Tests included | 100 nitrate tests, 100 phosphate tests |
| Nitrate range | 0–64 ppm |
| Nitrate resolution | 0.125 ppm |
| Phosphate range | 0–5 ppm |
| Phosphate resolution | 0.02 ppm |
| Method | Colorimetric comparator |
| Water type | Marine / reef |
Suitable for, and not suitable for
- Suitable for marine and reef aquarists tracking nitrate and phosphate as part of a nutrient control or algae management routine.
- Suitable as the weekly check while dosing Red Sea NO3:PO4-X.
- Not a substitute for a digital nitrate/phosphate monitor where continuous logging is needed — this is a manual, on-demand test.
Care and maintenance
Store the kit closed, away from direct light and extremes of temperature, and check reagents haven't passed their use-by date before a critical test. Rinse test vials thoroughly between uses so residue from one test doesn't skew the next.
Goes well with
- Red Sea NO3:PO4-X 1 L — the nitrate and phosphate reducer this kit's readings are used to dose.
- Red Sea Phosphate Pro Testing Kit — a higher-resolution titration option if you need finer phosphate readings than the comparator format gives.
Warranty and delivery
Backed by Red Sea's standard product warranty, in addition to your rights under Australian Consumer Law. Ships as a standard parcel.
Common questions
What's the difference between this and Red Sea's Pro test kits?
This kit uses a colorimetric comparator — you match a colour against a printed card. Red Sea's Pro range (sold separately) uses titration for finer resolution. The comparator format here is faster and simpler for routine weekly checks.
How many tests does the kit actually include?
100 nitrate tests and 100 phosphate tests — enough for roughly two years of weekly testing on both parameters.
Can I use this kit to set my NO3:PO4-X dosing rate?
Yes — Red Sea's NO3:PO4-X dosing chart is keyed to nitrate and phosphate readings in exactly the ranges this kit measures.
Does this kit work for freshwater tanks?
It's formulated and ranged for marine and reef use. A freshwater-specific nitrate or phosphate kit will give more usable resolution at freshwater's typically lower target levels.
