Fluval Biological Cleaner helps reduce aquarium maintenance by helping to reduce waste in gravel, power filters, decoration and on interior aquarium surfaces. Fluval Biological Cleaner rapidly reduces organic waste from overfeeding, fish waste and other decaying material such as plant leaves and is especially beneficial for goldfish, cichlids, heavily populated and other aquariums where greater amounts of fish waste are expected. Fluval Biological Cleaner is suitable for fresh and saltwater tanks.