Want sparkling clear water in your reef or marine fish-only aquarium? Use Kent Marine Tank Clarifier to help your filtration system clarify water more efficiently! pH-balanced marine tank clarifier attaches to unsightly particulate matter for easy removal through filtration. Safe for corals, anemones, invertebrates, zooxanthellae and macroalgae. Does not contain nitrates or phosphates. Use over 6 consecutive days as directed and then as part of a regular aquarium maintenance schedule.