Jungle Labs Correct pH Tank Buddies maintains neutral pH in community tanks (between 6.8 - 7.2) and holds it for several weeks. Also prevents stress in fish from sudden pH changes, promotes favorable conditions for tropical fish and live plants, and helps lower harmful ammonia levels. The fizz lets you know it's working!Details: If used in very hard water, cloudiness may occur. The ingredients in the product react with the minerals. Can be cleared up with regular water changes. Repeat as necessary, taking care not to change the pH level more than .5 every 24 hours. Will maintain the proper pH level for several weeks depending on system load and water changes.