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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 nitrit...

API Accu-Clear water clarifier quickly clarifies cloudy water in your aquarium, eliminating haze to make your water crystal clear. API Accu-...

API Accu-Clear water clarifier quickly clarifies cloudy water in your aquarium, eliminating haze to make your water crystal clear. API Accu-Clea...

API Accu-Clear water clarifier quickly clarifies cloudy water in your aquarium, eliminating haze to make your water crystal clear. API Accu-...

API AlgaeFix algae control effectively controls many types of algae in aquariums and will not harm to your fish or plants when used as direc...

API Marine AlgaeFix algae control effectively controls these types of saltwater algae: Green algae (Cladophora), “Red Slime” (Oscillatoria &...

Salicylate test measures ammonia levels in both fresh & saltwater aquariums. Ammonia, the #1 killer of tropical fish, is continually prod...

Treat your tap water, and provide a safe environment for freshwater fish instantly and easily with API Aqua Essential water conditioner....

Treat your tap water, and provide a safe environment for freshwater fish instantly and easily with API Aqua Essential water conditioner. Tap...

Tests tap water & fresh or saltwater aquariums for carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the resu...

API® FIN & BODY CURE fish remedy treats bacterial fish diseases that produce symptoms such as body slime, eye cloud, fin & tail rot, ope...

An all natural salt, made from evaporated sea water. Helps improve gill function to reduce stress. Reduces electrolyte loss and promotes healthy...

An all natural salt, made from evaporated sea water. Helps improve gill function to reduce stress. Reduces electrolyte loss and promotes healthy...

API® pH DOWN pH adjuster lowers pH to make freshwater aquariums more acidic for fish and plants when levels rise too high. pH is the measure...

API® pH DOWN pH adjuster lowers pH to make freshwater aquariums more acidic for fish and plants when levels rise too high. pH is the measure...

The API® pH TEST KIT monitors pH to maintain healthy freshwater conditions in your tank. pH control is imperative to prevent the harmful eff...

API® pH UP pH adjuster raises pH levels in your aquarium to make water more alkaline when levels fall too low. pH is the measure of acidic o...

API® pH UP pH adjuster raises pH levels in your aquarium to make water more alkaline when levels fall too low. pH is the measure of acidic o...

API Pond Accu-Clear Water Clarifier quickly clears cloudy pond water by causing tiny suspended particles to clump together, forming larger particle...

Treat your tap water, and provide a safe environment for koi fish instantly and easily with API Pond Aqua Essential water conditioner. Tap water co...

All-natural sea salt improves gill function, protects against nitrite toxicity & reduces stress by helping maintain a natural balance of ele...

Easy-to-use, fast dissolving powder that automatically sets and stabilizes pH while neutralizing chlorine and detoxifying heavy metals. Contains...

Easy-to-use, fast dissolving powder that automatically sets and stabilizes pH while neutralizing chlorine and detoxifying heavy metals. Contains...

Easy-to-use, fast dissolving powder that automatically sets and stabilizes pH at 7.5 while neutralizing chlorine and detoxifying heavy metals. C...