Tropical TEST NO2 Nitrite Test Kit for Aquariums

The Tropical TEST NO2 is a nitrite test kit designed for use in both freshwater and saltwater aquariums. It measures nitrite (NO₂⁻) concentrations across a range of 0–3.3 mg/L, giving aquarium keepers a clear, reliable reading of one of the most critical water parameters to monitor.

What It Tests and Why It Matters

Nitrites form in aquariums as bacteria break down fish waste, uneaten food, and other organic matter. Unlike nitrates, which build gradually and are manageable through water changes, nitrites are acutely toxic to fish even at low concentrations. The target reading should always be zero — any detectable level warrants immediate action. Elevated nitrite is most common in new tanks undergoing the nitrogen cycle, overstocked setups, or systems recently treated with bactericidal agents.

Measurement Range

• Tests nitrite (NO₂⁻) levels from 0 to 3.3 mg/L
• Suitable for use in freshwater and saltwater aquariums

How to Use

The dropper method makes this kit straightforward to use. Add the included reagent solution to your water sample drop by drop until the sample changes colour, then compare the result against the provided colour scale. No specialist equipment is required.

Keeping on top of nitrite levels is a fundamental part of responsible fishkeeping. The Tropical TEST NO2 gives you a fast, hands-on way to stay informed and act before water quality becomes a problem for your livestock.