API
API (Aquarium Pharmaceuticals) is best known for its color-change liquid test kits. Shop the API Saltwater and Reef Master test kits, single-parameter kits for ammonia, nitrite, nitrate, phosphate, pH, KH, and calcium, the AquaSpin photometer and its test d... Read more Show less
API (Aquarium Pharmaceuticals) is best known for its color-change liquid test kits. Shop the API Saltwater and Reef Master test kits, single-parameter kits for ammonia, nitrite, nitrate, phosphate, pH, KH, and calcium, the AquaSpin photometer and its test discs, plus fish medications like Melafix, General Cure, and EM Erythromycin.