Testing the Waters

In order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness and even loss. Most common water quality parameters are Ammonia, Nitrite, Nitrate, and pH. All may vary over time and all are invisible to the eye which is why it is important to test weekly. Testing aquarium water weekly will aid in keeping your most important water parameters within the proper range for your aquarium. Choose from a wide range of API testing options, such as our popular FRESHWATER MASTER TEST KIT or 5-IN-1 TEST STRIPS, for accurate water evaluation. Regular testing will help you easily determine your aquarium conditions.

Find Your Ideal Testing Style!

Your API Test Options

Choose the test method that works best for you. Whether you’re a bit pressed for time, or you prefer to measure your parameters on a more in-depth scale, or you only need to test one or two specific parameters, API has what you need!

Dip and Read

Just dip a 5-in-1 TEST STRIP in your aquarium, swirl twice, and compare to our color chart for fast and accurate results.

The Scientific Approach

For more detailed analysis, use the FRESHWATER MASTER TEST KIT, POND MASTER TEST KIT, SALTWATER MASTER TEST KIT, or REEF MASTER TEST KIT for precise readings of parameters.

Pick One (or Two)

Need to check your phosphate levels? What about ammonia? API offers specific test kits to test many different parameters, from general hardness and copper to pH and nitrate. Grab the one you need for a streamlined approach to testing.

Product comparison chart. Products are listed in columns, features in rows.
Product images and names	API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 16-Ounce Bottle	API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier 16-Ounce Bottle	API pH UP Freshwater Aquarium Water pH Raising Solution 16-Ounce Bottle	API pH DOWN Freshwater Aquarium Water pH Reducing Solution 16-Ounce Bottle	API NITRA-ZORB SIZE 6 Aquarium Canister Filter Filtration Pouch 1-Count Bag	API PHOS-ZORB SIZE 6 Aquarium Canister Filter Filtration Pouch 1-Count Bag
Features
Too much nitrites?	Yes				Yes
Too much ammonia?	Yes	Yes			Yes
Inappropriate pH levels?			Yes	Yes
Too much nitrates?					Yes
Too much phosphates?						Yes

Product comparison chart. Products are listed in columns, features in rows.
Feature names	Too much nitrites?	Too much ammonia?	Inappropriate pH levels?	Too much nitrates?	Too much phosphates?
API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria 16-Ounce Bottle	Yes	Yes
API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier 16-Ounce Bottle		Yes
API pH UP Freshwater Aquarium Water pH Raising Solution 16-Ounce Bottle			Yes
API pH DOWN Freshwater Aquarium Water pH Reducing Solution 16-Ounce Bottle			Yes
API NITRA-ZORB SIZE 6 Aquarium Canister Filter Filtration Pouch 1-Count Bag	Yes	Yes		Yes
API PHOS-ZORB SIZE 6 Aquarium Canister Filter Filtration Pouch 1-Count Bag					Yes

Create Your Own Underwater World

At API we understand the rewards and relaxation of fishkeeping because we have a passion for fish too! For over 50 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world.