Seachem Ammonia Alert by Aquatic Arts
Provides a constant visual reading for toxic ammonia.
Uses: Ammonia Alert™ is a great aid for novice and veteran aquarists alike. It provides a constant visual reading of toxic ammonia, the number one killer of aquatic animals in an aquarium setting. Having this product provides peace of mind and enables faster reactions to ammonia spikes, which are a serious emergency for your aquarium that must be dealt with immediately. Consider using with our other products.
From the manufacturer: Ammonia Alert™ is an innovative color device for continuously detecting and monitoring toxic-free ammonia. A sensor changes reversibly from yellow to green to blue, relative to the ammonia concentration. No test kits, chemicals, or complex procedures are required.
| Ammonia Concentration | Color Indicator |
|---|---|
| Low (0-0.25 ppm) | Green |
| Moderate (0.25-0.5 ppm) | Yellow |
| High (above 0.5 ppm) | Blue |
FAQ
How does the Ammonia Alert sensor work?
The sensor changes color reversibly based on ammonia concentration: green for low levels, yellow for moderate, and blue for high levels. It provides a visual, real-time reading without requiring chemicals or test kits.
Can I use Ammonia Alert with other aquarium monitoring devices?
Yes, it is designed to work alongside other aquarium monitoring tools to provide a comprehensive view of water quality.
How often should I check the Ammonia Alert sensor?
It provides continuous monitoring, so you can check the color at any time. For best results, inspect it daily or after any water changes or fish additions.

Anthony Lyman –
Easy to use and very effective. I noticed the color change clearly after a fish addition. It helped me catch a spike early and adjust my water parameters before any harm occurred. No chemicals needed, just a quick visual check.
Neil Welch –
Works well for daily monitoring. The color shift from yellow to green is noticeable and helps me stay on top of ammonia levels. A reliable tool for both beginners and experienced aquarists.
Abigail Wright –
I’ve had a few ammonia spikes in the past and this device gave me early warning. The green to blue transition is clear and easy to interpret. It’s a simple, effective solution for maintaining stable water conditions.