Brightwell NeoNitro — balanced nitrate source for ULNS reef aquariums

The Brightwell NeoNitro is a nitrogen source aimed at advanced reef aquarists running an ultra-low nutrient system (ULNS). Formulated in the United States by Brightwell Aquatics, it lets tank biology keep consuming nutrients when NO₃ drops so low that the carbon-nitrogen-phosphorus cycle breaks down and beneficial microbes run out of nitrogen for turning organic material into biomass.

On a well-tuned ULNS, nitrate is not a "pollutant to eliminate" but a nutrient building block whose stock must be kept low and stable so biology can do its job. NeoNitro raises NO₃ back into a target range where microbiology resumes work on ammonia, nitrite, and phosphate.

What NeoNitro is for and when to use it

Starved SPS ULNS tanks — corals pale out, tissue density drops, growth stalls because NO₃ is too low.
Carbon-nitrogen biology stall — when PO₄ refuses to go down because biology lacks nitrogen to pull it in.
Unbalanced probiotic method — NP Pro or VSV routines that have pushed NO₃ too low and triggered a biological quality drop.
Reduced feeding — lightly stocked tank where waste output no longer feeds the microbes.

Brightwell official use

NeoNitro has been sold in more than one strength. Always check the bottle label for the number of gallons treated and the ppm ratio — the value printed on your bottle is the only reliable reference.

Dosing procedure: test NO₃ and PO₄ with accurate test kits or a calibrated digital instrument before every dose.
Initial target: approximately 3 ppm NO₃; then maintain 3 to 5 ppm.
Shake well before use. Do not overdose.
If NO₃ has not moved 24 hours after the dose, the system is likely carbon-limited — add Reef BioFuel at 1 mL per 25 US gal to restart consumption.
Keep dosing until PO₄ reaches its target range (0.01-0.02 ppm).

Specifications

Brand: Brightwell Aquatics (made in the USA)
Available sizes: 250 mL, 500 mL, 2 L, 4 L, 20 L
Composition: purified water and proprietary nitrogen salts
Variable concentration: check the label of the bottle received (multiple historical versions)
Intended audience: advanced reef aquarists running ULNS systems

Why choose Brightwell at ReefSolution

Brightwell NeoPhos — the phosphate booster that balances NeoNitro to keep a healthy N:P ratio on a ULNS.
Salifert Nitrate Test Kit — the titration kit with a low range down to 0.05 ppm required to steer NeoNitro.
Brightwell MicroBacter7 — the bioculture that uses the added NO₃ to resume its work on ammonia and PO₄.

Frequently asked questions

Why add nitrate to a reef aquarium?

On a densely coraled, lightly fished ULNS, nitrate consumption outpaces production — NO₃ falls below 1 ppm and microbial biology lacks nitrogen to convert organic material into biomass. Result: PO₄ stops falling, SPS pale out, chemistry goes sideways. NeoNitro raises NO₃ back into the Brightwell target range of 3 to 5 ppm to reset the cycle.

How many ppm does my NeoNitro add per mL?

Brightwell states that multiple NeoNitro concentrations have been sold — the ppm/gal value is printed on your bottle's label. That is the only reliable reference for calculating your dose; going off a value found online for a different batch risks overshoot or undershoot.

What if NO₃ does not rise after a NeoNitro dose?

Retest after 24 hours. If nitrate is unchanged, Brightwell states the system is likely carbon-limited — biology lacks organic carbon to take up the added nitrogen. The brand recommends adding Reef BioFuel at 1 mL per 25 US gal to restart consumption.

Can NeoNitro be combined with NeoPhos?

Yes — that is actually the recommended routine on an unbalanced ULNS: NeoNitro brings NO₃ back toward 3-5 ppm while NeoPhos brings PO₄ back toward 0.01-0.02 ppm. Both products work in synergy with MicroBacter7 to restore a healthy N:P ratio.