{"product_id":"fritz-nitrite-test-kit-aquarium","title":"Fritz Nitrite Test Kit","description":"\u003cp\u003eThe \u003cstrong\u003eFritz Nitrite Test Kit\u003c\/strong\u003e is a liquid reagent test for measuring nitrite (NO₂⁻) in freshwater and saltwater aquariums. Nitrite is the second toxic compound to spike during a tank's nitrogen cycle and is lethal to fish even at low concentrations — testing for it weekly (and daily while cycling) is essential. Pair with our other \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003ewater testing\u003c\/a\u003e kits and \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003ewater care\u003c\/a\u003e supplies.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eWhy Test Nitrite\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCritical during cycling\u003c\/strong\u003e — nitrite spikes between the ammonia and nitrate phases of every new tank's cycle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eToxic at low levels\u003c\/strong\u003e — even 0.25 ppm can stress and kill sensitive fish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiagnose a stalled cycle\u003c\/strong\u003e — persistent nitrite means your biological filter isn't fully established yet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShould always read 0 ppm\u003c\/strong\u003e in a fully cycled, healthy tank\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;font-size:0.95em;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eFritz Aquatics\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eTests For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eNitrite (NO₂⁻)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eTest Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eLiquid reagent + color comparator\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eWater Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003eFreshwater \u0026amp; saltwater\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e\u003cstrong\u003eTarget Reading\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #BBDEFB;padding:6px 10px;\"\u003e0 ppm in a cycled tank\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/fritz-ammonia-test-strips-freshwater-saltwater\"\u003eFritz Ammonia Test Strips\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/fritz-general-hardness-gh-test-kit-freshwater\"\u003eFritz GH Test Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eBrowse all water testing kits\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003eWater care \u0026amp; maintenance\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #1E88E5;padding-left:8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMy nitrite is reading above 0 — what now?\u003c\/strong\u003e\u003cbr\u003e\nDo an immediate water change (25–50%) and add a dechlorinator that detoxifies nitrite (like Fritz Complete). If you're still cycling, continue dosing ammonia and testing daily until both ammonia and nitrite read 0 and nitrate is showing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow often should I test?\u003c\/strong\u003e\u003cbr\u003e\nDaily during fishless or fish-in cycling. Weekly for established tanks. Anytime you spot fish flashing, gasping, or unusual behavior.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre liquid tests really more accurate than strips?\u003c\/strong\u003e\u003cbr\u003e\nYes — significantly. Strips work for quick screens but liquid is what you want for diagnosing real problems.\u003c\/p\u003e","brand":"Fritz","offers":[{"title":"Default Title","offer_id":48743159431387,"sku":"04002","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_312842d5-73a1-491d-af1f-12de0476728a.png?v=1777924391","url":"https:\/\/squeakysaquatics.com\/products\/fritz-nitrite-test-kit-aquarium","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}