PolypLab Genesis is a Concentrated Mixture of Dormant Bacterial Strains.Working with a Canadian biotechnology firm, PolypLab has manufactured a custom blend of bacterial strains with concentrations of over 80 billion cells/mL.In their planktonic state, these bacteria serve as a highly nutritious food source for corals and zooplankton. More importantly, these complimentary bacterial strains form nutrient-consuming biofilms adding a tremendous amount of beneficial bacteria to your aquarium. Genesis can also be used to cycle new tanks or help increase bacteria growth in cycling tanks.Directions: 1 drop per 25 gallons of total system water volume daily. Increase to 4 drops daily per 20 gallons for two weeks if using to cycle a new system. Size: 50 mL