API Nitrite Test Kit (180-test)
A dedicated liquid nitrite kit for cycling a new tank — reads the low range that matters when nitrite is spiking and fish are at risk.
- +Liquid reagent gives granular readings at the low nitrite range a strip pad cannot resolve
- +Hundreds of tests per bottle — an economical cost per test while you cycle
- +Numbered vials, a clear colour chart and good instructions
- +Pairs with a master kit to confirm the ammonia nitrite nitrate cycle has finished
- −Single parameter — only really useful during cycling or a suspected spike
- −The colour step between safe and toxic is subtle at the very bottom
This is the API Nitrite Test Kit, a dedicated liquid kit reading the low nitrite range (0 to 5 ppm) that matters when cycling a new tank and nitrite is spiking, roughly 180 tests per bottle. It reads the range a strip pad cannot resolve at the point fish are at risk.
- Cycling a new tank, where nitrite spikes are the danger
- Confirming a suspected nitrite spike
- Pairing with a master kit to confirm the cycle has finished
- Established, cycled tanks, where nitrite reads zero and this sits unused
- Anyone wanting multiple parameters, since it is nitrite only
- Reading the very bottom of the range in poor light, where steps are subtle
We separate what the maker claims from what independent sources confirm, what owners report, and where we are drawing an inference. We do not bench-test products.
- Liquid reagent, 0 to 5 ppm nitrite range
- Roughly 180 tests; about a 3-year shelf life
- Numbered vial and a laminated colour card
- It reads nitrite only, most useful during cycling
- The colour step between safe and toxic is subtle at the very bottom
- Very well rated for cycling a tank
- The right tool while cycling: granular low-range nitrite when it matters, though a master kit covers this plus ammonia and nitrate together
Low cost per test, but single-parameter, so most keepers get more value from the master kit unless they specifically need extra nitrite tests during a long cycle. Reagents age over about three years.
- Misjudging the subtle low-end colour step
- Buying it standalone when a master kit would cover the whole cycle
- Aged reagents that drift
We do not lab-verify accuracy; we relay the manufacturer's specifications and well-documented usage caveats. We give gear and method guidance only, not livestock or disease advice; route fish-health questions to a veterinarian or an established authority.
Not usually; the Master Kit already includes nitrite. This standalone kit suits topping up nitrite tests during a long cycle or replacing an aged reagent.
During cycling, when ammonia converts to nitrite before nitrate. A nitrite spike is toxic to fish, so it is the number to watch on a new tank.
The colour step between safe and toxic is subtle at the bottom of the range; read in good light and compare carefully against the card.