API GOLDFISH AQUARIUM CLEANER cleans Goldfish bowls or aquariums by breaking down and naturally consuming fish waste. Also works to reduce sludge build-up to help keep gravel clean. Use when cleaning or adding water. With API aquarium products, its easy to keep a beautiful saltwater, freshwater or reef aquarium. or almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because were dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.