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API® 5-IN-1 TEST STRIPS are the quick and easy way to test the 5 most important aquarium water parameters – pH, KH, GH, nitrate, and nitrite – in o...

API® 5-IN-1 TEST STRIPS are the quick and easy way to test the 5 most important aquarium water parameters – pH, KH, GH, nitrate, and nitrite – in o...

API Accu Clear - Select bottle size from the drop down menu when ordering   API® ACCU-CLEAR water clarifier quickly clarifies cloudy water in your...

API Ammo Lock - Select bottle size from the drop down menu when ordering   API® AMMO LOCK ammonia detoxifier is proven to convert poisonous ammoni...

Use the API® AMMONIA TEST STRIPS as the quick and accurate way to test for the presence of ammonia. Kit reads 0 to 6 ppm of ammonia, and alerts you...

API Aqua Essential - Select bottle size from the drop down menu when ordering   AQUA ESSENTIAL water conditioner is a highly concentrated all-in...

API Aquarium Salt - Select bottle size from the drop down menu when ordering   API® AQUARIUM SALT is made from evaporated sea salt and is a must-h...

API CO2 Booster - Select bottle size from the drop down menu when ordering   Carbon deficiency is one of the leading causes of poor plant growth i...

API CO2 Booster - Select bottle size from the drop down menu when ordering   Carbon deficiency is one of the leading causes of poor plant growth i...

With scientific accuracy for professional results, the reusable FRESHWATER MASTER TEST KIT comes with 4 glass test tubes with snap-tight caps and a...

API® GOLDFISH AQUARIUM CLEANER makes cleaning your goldfish tank simple and easy! This product helps keep gravel clean and removes organic sludge, ...

API GOLDFISH PROTECT makes tap water safe for goldfish by removing harmful chlorine, chloramine, and ammonia from tap water. It also detoxifies amm...

API Leaf Zone - 237ml   API® LEAF ZONE plant fertilizer contains iron & potassium for colorful leaves and a vibrant planted aquarium. Product i...

API Leaf Zone - 473ml   API® LEAF ZONE plant fertilizer contains iron & potassium for colorful leaves and a vibrant planted aquarium. Product i...

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 i...

API Liquid Calcium Test KitCalcium is one of the most important elements in a reef aquarium. Reef invertebrates, such as corals, crustaceans, mollu...

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 treatmen...

API Liquid GH & KH Test Kit When keeping freshwater fish and plants, the general hardness (GH) and carbonate hardness (KH) of aquarium water sh...

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...

The API KH TEST KIT tests fresh or saltwater aquariums for carbonate hardness (KH), and helps monitor water quality and prevent invisible water pr...

API Liquid Nitrate Test Kit High nitrate levels in your aquarium indicate a build-up of fish waste and organic compounds, resulting in poor water q...

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...

Phosphate can enter your aquarium through tap water, fish waste, and decaying organics such as uneaten food and dead algae. Excess phosphate contri...

API Melafix - Select bottle size from the drop down menu when ordering   API® MELAFIX fish remedy is an all-natural antibacterial treatment that wo...