Collection: Aquarium Pharmaceuticals (API)

API (Aquarium Pharmaceuticals) has spent decades building freshwater, saltwater and reef products that make water chemistry easier to manage. The range here centres on accurate liquid test kits — the Freshwater, Saltwater and Reef Master Kits alongside individual ammonia, nitrate, phosphate, calcium and pH tests.

You'll also find API's well-known treatments, including Stress Coat, Stress-Zyme and Melafix, for conditioning water and supporting fish health. Liquid reagent kits hold their accuracy better than strips, provided the bottles are in date.