Seachem MultiTest™ – Nitrite & Nitrate Test Kit Nitrite and nitrate are two parameters you really want under control if you care about fish health — and this kit tells you exactly where your tank stands, without guesswork. Nitrite is toxic and in any well-established aquarium it should be completely undetectable. During the cycling phase, though, it can spike hard — sometimes exceeding 20 mg/L. That’s where this test kit really earns its keep. Nitrate, on the other hand, is relatively non-toxic, but letting it creep up over time is one of the biggest reasons fish slowly decline. Keeping it under 20 mg/L is ideal for long-term health, colour, and breeding success. The Seachem MultiTest™ Nitrite/Nitrate kit gives you extremely fine resolution, allowing you to catch problems early — before your fish show signs of stress. What makes this test kit so good Measures nitrite down to
