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Message: [QUOTE="DoDad, post: 217924, member: 1534"] [B]Dissolved organic carbons[/B] (DOCs) are just what the term implies: organic materials that are dissolved in the water. Organic material can come from a variety of sources including plants, uneaten food and fish waste. DOCs may “show” themselves [B]as bubbles on the surface of the water, e.g., foam[/B] on the water and/or as a yellowy tinge in the water. Elevated organics in the pond may depress the fish’s immune system which can lead to increased susceptibility to disease. Some fish parasites thrive in high DOCs. Additionally, while organic material decomposes, it consumes oxygen. This may lead to a shortage of oxygen for the fish. Some common causes of a DOCs buildup include a lack of water changes, lack of pond and plant maintenance and over stocking. Correcting these problems will help control DOCs. [/QUOTE]