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For over 50 years, API has been a leader in the Aquatics industry developing and perfecting products and solutions for indoor aquariums. API’s family of products includes treatments, testing, nutrition, and equipment and pond products.

The research and development scientists at API have pioneered scientific studies on aquarium treatments that have led to significant advances in the care of ornamental fish.  This work has garnered over 25 global patents for breakthrough innovations in the aquatic industry.

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    API Saltwater Master Test Kit

    $22.99
    The API® Saltwater Master Test Kit measures the 4 most important saltwater parameters – pH, ammonia, nitrite, and nitrate – to enable easy testing of your tank’s natural cycle, and to...

    API Freshwater Master Test Kit

    $22.99
    The API® Freshwater Master Test Kit measures the 4 most important levels in freshwater aquariums quickly and accurately, including pH, high range pH, ammonia, nitrite, and nitrate. With scientific accuracy for...

    API Reef Master Test Kit

    $25.99
    The API® Reef Master Test Kit test 4 key parameters – calcium, carbonate hardness, phosphate, and nitrate – to keep reef inhabitants healthy. Testing is fast, easy, and accurate, yielding precise...

    API pH Test Kit

    $3.99
    The API® pH Test Kit monitors pH to maintain healthy freshwater conditions in your tank. pH control is imperative to prevent the harmful effects of overly alkaline or acidic aquarium water...

    API High Range pH Test Kit

    $4.59
    The API® High Range pH Test Kit measures pH changes in marine aquariums, aquariums with African Cichlids, and very alkaline tap water. The API® High Range pH Test Kit reads the pH...

    API Ammonia Test Kit

    $7.99
    The API® Ammonia Test Kit measures ammonia to help prevent fish loss, as ammonia is the number one stressor and killer of tropical fish. Ammonia is released into an aquarium in...

    API Nitrate Test Kit (NO3)

    $8.59
    High nitrate levels in your aquarium indicate a build-up of fish waste and organic compounds, resulting in poor water quality and an increase in algae growth. Contrarily, maintaining a low...

    API Nitrite Test Kit (NO2)

    $5.99
    Nitrite is produced in the aquarium in the forms of fish waste, uneaten food, and by nitrifying bacteria in your aquarium’s natural cycle as it breaks down ammonia. Low levels...

    API Calcium Test Kit

    $7.99
    Calcium is one of the most important elements in a reef aquarium. Reef invertebrates, such as corals, crustaceans, mollusks, and even some type of encrusting algae, need calcium to grow...

    API Copper Test Kit

    $6.99
    Copper – a treatment for many parasitic infections – must be monitored in an aquarium or a pond. The copper level can drop too low for the treatment to be...

    API Phosphate Test Kit

    $9.99
    Phosphate can enter your aquarium through tap water, fish waste, and decaying organics such as uneaten food and dead algae. Excess phosphate contributes to unsightly algae and green water blooms,...

    API KH Carbonate Hardness Test Kit

    $4.59
    The API® KH Carbonate Hardness Test Kit tests fresh or saltwater aquariums for carbonate hardness (KH), and helps monitor water quality and prevent invisible water problems that can be harmful to...

    API GH & KH Test Kit

    $6.69
    When keeping freshwater fish and plants, the general hardness (GH) and carbonate hardness (KH) of aquarium water should match their natural habitat. The API® GH & KH Test Kit helps you...

    API 5-in-1 Aquarium Test Kit Strips

    $9.99
    API® 5-in-1 Aquarium Test Strips are the quick and easy way to test the 5 most important water parameters – pH, KH, GH, nitrate, and nitrite – in one easy step....

    API MelaFix

    $5.99
    API® Melafix is an all-natural antibacterial treatment that works to treat infections in fish. Common bacterial infections are open wounds and abrasions, tail rot, eye cloud, and mouth fungus. API Melafix...
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