Nutri-SeaWater™ can be added to existing Synthetic Saltwater Aquariums to provide the missing natural Live heterotrophic marine bacteria, natural trace elements and natural critical nutrients needed "For a Healthier Aquarium"™. For routine water changes: It is recommended to change a protion of your aquarium water 10-20% of volume regulary with Nutri-SeaWater™ to restore your marine system to Naturess Ocean®. For New Aquarium Setup: To achieve Instant Cycling® use Nature's Ocean® Bio-Active Live® Aragonite Reef Sand or Substrate along with Nutri-SeaWater™ to provide the perfect start