Nutrafin Waste Control Biological Aquarium Cleaner, 1-Ounce Biological aquarium cleaner helps decrease aquarium maintenance by reducing waste in gravel, power filters, decorative features and on interior aquarium surfaces Waste control's rapidly reduces organic waste from overfeeding, fish waste and other decaying material such as plant leaves Waste control is especially beneficial for goldfish, cichlids, heavily populated and other aquariums where greater amounts of fish waste are expected Measures 1-1/5-inch length by 1-1/5-inch width by 2-5/7-inch height Comes in 1-ounce