Keep your aquatic life healthy and thriving by testing your aquarium water's calcium levels regul

Measure the most important reef aquarium levels including calcium, carbonate hardness (KH), phosp

Protect marine fish and invertebrates from unsafe water conditions with API SALTWATER MASTER TEST

Good water quality is the key to a healthy, beautiful aquarium.

Keep your fish healthy and thriving by testing your aquarium water's KH levels regularly with thi

Treat your tap water, and provide a safe environment for freshwater fish instantly and easily wit

Treat your tap water, and provide a safe environment for freshwater fish instantly and easily wit

Keep your fish healthy and thriving by testing your aquarium water regularly with easy-to-use API

Fish continually release ammonia into the aquarium through their gills, urine and solid waste.

API TEST TUBES serve as replacement test tubes for those included in API TEST KITS.

API AQUARIUM START-UP PACK comes with one 37 ml bottle of API STRESS COAT, and one 37 ml bottle o

API ALGAE SCRAPER GLASS uses an extra-long, extra-strong handle with durable scrubbing pad for ea