Offers a generous amount of microorganisms and bacteria strains to establish and maintain a biologically balanced aquarium. Also breaks down harmful organic sludge buildup that can cause ammonia and nitrite poisoning, low oxygen levels, cloudy water and low ph. Use start zyme when setting up an aquarium, making regular water changes, and adding fish. For freshwater and saltwater. Use weekly to ensu re healthy fis h and a clean aquarium.