Brightwell Aquatics MicroBacter7, Complete bioculture for establishing Biological Filtration & Rapidly improving Water Quality, 125ml Brightwell Aquatics MicroBacter7 is a complete bioculture for establishing biological filtration and improving water quality in all marine and freshwater aquaria Reduces organic carbon, ammonia, nitrite, nitrate and phosphate Digests uneaten foods, excretia and detrius for a cleaner aquarium Increases dissolved oxygen production Limits availability of pre-existing phosphate to undesirable forms of algae and cyanobacteria