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Tetra Test NH3 (Ammonia) measures and reliably determines the total ammonia content in freshwater aquariums, saltwater tanks, and ponds. Ammonia, a harmful compound produced from organic substances like fish waste and uneaten food, breaks down into nitrite and ultimately nitrate as part of the nitrogen cycle. Maintaining ammonia levels below 0.25 mg/l is vital for the long-term health of your fish.