API Ammonia Test Kit for Freshwater & Saltwater Aquariums

API Ammonia Test Kit is an essential aquarium water testing kit used to monitor ammonia levels in freshwater and saltwater aquariums. Ammonia is highly toxic to fish and invertebrates, and even small amounts can cause stress, illness, or death if not addressed quickly.

This easy-to-use test kit helps aquarists detect ammonia spikes early, making it especially important for new aquariums, cycling tanks, overstocked aquariums, and established tanks where water quality needs to be monitored regularly.

Key Features

• Measures ammonia levels (NH₃/NH₄⁺) in aquarium water
• Works in both freshwater and saltwater aquariums
• Helps detect toxic ammonia early to protect fish health
• Great for new tanks, cycling aquariums, and routine water testing
• Easy-to-read color chart and liquid test solutions
• Provides up to 130 tests per kit
• Helpful for troubleshooting fish stress, cloudy water, or water quality issues

Great For

• Freshwater aquariums
• Saltwater aquariums
• New aquarium setups
• Cycling fish tanks
• Community aquariums
• Shrimp tanks
• Testing after fish loss, overfeeding, or filter issues

Why Test for Ammonia?

Ammonia is one of the most dangerous water quality problems in an aquarium. It can build up from fish waste, uneaten food, decaying plants, dead livestock, or an uncycled filter. Testing ammonia regularly helps you catch problems before they become harmful to your fish.

Product Details

• Brand: API
• Product: Ammonia Test Kit
• Tests: Up to 130 tests
• Use: Freshwater and saltwater aquariums
• Measures: Ammonia (NH₃/NH₄⁺)

Frequently Asked Questions

How often should I test for ammonia?

For new aquariums, cycling tanks, or tanks with recent problems, test 2–3 times per week. For established aquariums, weekly testing is a good habit, especially after water changes, adding new fish, or noticing unusual fish behavior.

What is a safe ammonia level?

0 ppm is ideal. Any detectable ammonia should be addressed quickly because ammonia can be harmful to fish and invertebrates.

Is the API Ammonia Test Kit reusable?

Yes. The kit includes test solutions, test tubes, and a color chart for multiple uses. It provides up to 130 tests.

Can I use this test kit in a saltwater or reef tank?

Yes. The API Ammonia Test Kit can be used in both freshwater and saltwater aquariums.

When should I test ammonia immediately?

Test ammonia right away if fish are gasping, acting stressed, hiding, not eating, after a fish loss, after overfeeding, during a new tank cycle, or if your filter has stopped working.

Keep Your Aquarium Safe

The API Ammonia Test Kit is a must-have tool for aquarium owners. Regular ammonia testing helps protect fish, shrimp, snails, and other aquatic life by giving you early warning when water quality needs attention.

API Test Procedure

Fill the clean tube to 5 mL. Hold the reagent bottles vertically, add 8 drops from ammonia solution #1 and then 8 drops from solution #2. Cap and shake for 5 seconds, wait 5 minutes, then compare the result against the freshwater or saltwater color chart in good lighting. Rinse the tube afterward; never return used test water to the aquarium.

Choosing and Using This API Test

API liquid test for Ammonia; intended water type: freshwater and saltwater. Match the reagent instructions, sample amount, development time and color chart to this specific kit. Rinse the glass test tube after use, and never return the tested sample to the aquarium. This test measures one parameter (or the GH/KH pair for the combined kit), not a full aquarium-water profile. Measures total ammonia, including ionized ammonium, rather than specifically measuring free NH3 alone.

Accurate Ammonia Testing and Reagent Safety

Use a clean test tube containing 5 mL of aquarium water. Add 8 drops from reagent bottle 1 and 8 drops from bottle 2, holding each bottle vertically. Cap and shake for 5 seconds, wait 5 minutes, and compare the result with the appropriate freshwater or saltwater color chart. The manufacturer's stated test range is 0–8 ppm. Follow the instructions supplied with your kit.

Important: Never pour used test solution into an aquarium. Rinse testing equipment after use, keep reagents away from children, and check the expiration dates printed on the kit and reagent bottles. Test results need to be interpreted with aquarium pH, temperature and livestock condition in mind.