Sludge and detritus caused by a build up of fish and plant waste and uneaten food is unsightly and detrimental to fish health through harboring pathogens and polluting the water. Aquarium Cleaner is designed to digest organic material leading to a cleaner aquarium reducing the need to clean gravel and the risk of disease and algae growth. Aquarium Cleaner is a blend of enzymes and bacteria which can also support and encourage the activity of the biological filter bacteria. To help keep your aquarium cleaner for longer use with NT Labs Activated Carbon.