API

  • sixty years of proven API expertise

    Instant aquarium start

    Instantly add fish and start your aquarium cycle.
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  • betta water

    Water check-up kit

    Tests for two most harmful water toxins.
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  • pond algae fix

    Heal bacterial damage

    Heals bacterial infections and repairs damaged fins.
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Complete fish care

your underwater world made easy

Aquatic care center

New Releases

common tank problems solved

Treat tank trouble

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Help restore safer water and a healthier home for fish.

API Stress Coat Water Conditioner & Dechlorinator, 8 fl oz - Makes Tap Water Safe for Freshwater & Saltwater Aquariums
API Stress Coat Water Conditioner & Dechlorinator, 8 fl oz - Makes Tap Water Safe for Freshwater & Saltwater Aquariums
current price $11.49
API Stress Coat Water Conditioner & Dechlorinator, 8 fl oz - Makes Tap Water Safe for Freshwater & Saltwater Aquariums
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
current price $14.99, Was $17.00
$1.87/fl oz
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
API Algaefix Algae Control Solution, 16 fl oz - for Freshwater & Planted Aquariums
API Algaefix Algae Control Solution, 16 fl oz - for Freshwater & Planted Aquariums
current price $19.71, Was $25.49
API Algaefix Algae Control Solution, 16 fl oz - for Freshwater & Planted Aquariums
API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
current price $11.64
$1.46/fl oz
API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
current price $8.68, Was $11.00
$1.09/fl oz
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
API Stress Coat+ - 4 fl oz
API Stress Coat+ - 4 fl oz
current price $8.99
API Stress Coat+ - 4 fl oz
API Algaefix Algae Control Solution, 8 fl oz - for Freshwater & Planted Aquariums
API Algaefix Algae Control Solution, 8 fl oz - for Freshwater & Planted Aquariums
current price $9.05, Was $10.21
$1.13/fl oz
API Algaefix Algae Control Solution, 8 fl oz - for Freshwater & Planted Aquariums
API Pond Algaefix Algae Control Solution, 16 fl oz - for Outdoor Ponds & Fountains
API Pond Algaefix Algae Control Solution, 16 fl oz - for Outdoor Ponds & Fountains
current price $24.99
$1.56/fl oz
API Pond Algaefix Algae Control Solution, 16 fl oz - for Outdoor Ponds & Fountains
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
current price $19.98
$19.98/count
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums
current price $10.98
17.2 ¢/fl oz
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums
fish care for every experience level

From setup to care

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Find fish care for setup, maintenance and fish health.

API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
current price $11.64
$1.46/fl oz
API Accu-Clear Water Clarifier, 8 fl oz - Quickly Clears Cloudy Aquarium Water for Freshwater & Planted Aquariums
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
current price $8.68, Was $11.00
$1.09/fl oz
API Aqua Essential, 8 fl oz – All-in-One Dechlorinator & Complete Detoxifier for Freshwater & Saltwater Aquariums
API Stress Coat+ - 4 fl oz
API Stress Coat+ - 4 fl oz
current price $8.99
API Stress Coat+ - 4 fl oz
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
current price $14.99, Was $17.00
$1.87/fl oz
API Quick Start Nitrifying Bacteria 8 fl oz - Instantly Starts Freshwater & Saltwater Aquarium Cycle
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
current price $19.98
$19.98/count
API Aquarium Water Check-Up Test Kit, 300 Tests - Accurately Test for Ammonia & Nitrite in Freshwater & Saltwater Aquariums
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums
current price $10.98
17.2 ¢/fl oz
API Betta Water, 64 fl oz - Pre-Conditioned & Ready-to-Use for Instant Tank Setup & Water Changes for Freshwater Aquariums

Aquarium Help Center

Why is testing my aquarium water so important?

My new aquarium water is cloudy. What should I do?

What is "New Tank Syndrome" and how can I avoid it?

Are API medications safe for snails, shrimp, and live plants?

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