Waterlife ParagonWhen added to aquarium or pond water, Paragon slowly releases nascent, monatomic oxygen in safe amounts. Paragon raises the redox potential (oxygen levels) and helps break down organics such as fish waste, plant debris, etc. Paragon can be used every 10 to 14 days as a regular tonic to improve the health and well being of all aquarium inhabitants. Notes: Not suitable on Discus species. Suitable for seawater, tropical freshwater and coldwater aquaria.