Nutrafin Waste Control, Biological Aquarium Cleaner, 120 mL, helps reduce aquarium maintenance by helping to reduce waste in gravel, power filters, decoration and on interior aquarium surfaces. Waste control rapidly reduces organic waste from overfeeding, fish waste and other decaying material such as plant leaves. Ntrafin Wate Control is especially beneficial for goldfish, cichlids, heavily populated and other aquariums where greater amounts of fish waste are expected. During rapid organic waste break down ammonia levels may rise. The simultaneous use of Nutrafin Cycle biological Aquarium Supplement is strongly recommended to control and prevent potential increased ammonia and nitrite levels, supports optimal water quality and clean aquarium conditions.