Seachem Ammonia Alert 1 Year Monitor, 3 Pack

Seachem Ammonia Alert is a passive monitor that sits inside the aquarium and continuously detects free ammonia. There are no test kits, chemicals or procedures; you just look at it. Each monitor lasts over a year, and this pack contains 3.

How it works

A sensor disc changes color in the presence of free ammonia (NH3), the toxic form. Because it is always in the water, you see a problem when it happens, not only on the day you remember to test.

Free versus total ammonia

Most test kits measure total ammonia, which includes both toxic free ammonia and less harmful ammonium. Ammonia Alert reads only the free form. That is useful after a conditioner that binds ammonia, like Seachem Prime: a regular kit may still show a reading, while the Alert tells you whether the toxic part is present.

Where to place it

• Stick it to the glass where you see it daily.
• Keep it out of direct light, which can affect the sensor.
• Avoid spots with strong flow from the filter outlet.

Why a 3 pack

One monitor per tank for three tanks, or keep spares so you can swap in a fresh one when the year is up. Write the install date on the tank with a marker or note.

Limits

A sensor gives a running warning but not a precise number. During cycling, or when a reading looks off, confirm with a test such as API Ammonia Test Strips. Some medications and dyes can affect the sensor; check Seachem’s guidance if you treat the tank.

Who it suits

Busy keepers, people with several tanks and anyone who travels and has a sitter feeding fish. A sitter can glance at the color without knowing how to run a test.

Freshwater and saltwater

It reads free ammonia in both, so it works on reef, fish-only and freshwater tanks alike.