API Pond AlgaeFixAPI POND ALGAEFIX algae control effectively controls green water algae blooms, string or hair algae (Cladophora), and blanketweed (Oedogonium) in ponds containing live plants and fish. API POND ALGAEFIX algae control is fast acting, controls algae growth, controls the formation of new algae, and helps resolve algae problems. Registered with the EPA, API POND ALGAEFIX algae control controls many types of algae in water gardens, ponds, and ornamental