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1 ppm Ammonia in Tap Water


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I'm pretty new to the hobby and am enjoying this forum! I have the API master test kit and recently noticed a trace ammonia reading in one of my tanks. This was new, so I tested my tap water. The tap water reads 1 ppm ammonia! After 48 hours or so in the fish tank (it is fully cycled), the water will be down to trace to no ammonia. Any chance this 1 ppm reading is an artifact? Should I be concerned? I don't want to stress the fish every time I do a water change, but tap water is sort of my only option for water changes. I know our city water has chlorine and chloramines in it. Any help appreciated.

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