API Ammonia Test Strips are a quick, easy way to check your aquarium's ammonia level — the single most dangerous parameter for fish. A quick dip and a color-chart comparison tells you whether ammonia is present, which is essential while cycling a new tank and reassuring on an established one (where it should read zero). This is the 25-count tube.
Good to Know: Ammonia is invisible and lethal, so monitoring it is critical — especially in a new tank, after adding fish, or if something seems off. Strips are the convenient option for a fast check; a liquid ammonia kit gives more precision when you need an exact figure. One note: if you use a conditioner like Prime, a strip may still read some ammonia because it measures total (including the detoxified form) — usually not cause for alarm right after dosing.
How to Use: Dip per the label, wait the stated time, and compare to the chart. Test daily while cycling and whenever fish seem stressed. Keep the bottle sealed and dry.
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