Accumulated gases in the fish tank should be cleared by providing proper aeration and this method is called stripping. Respiration of fish produces carbon dioxide and bacteria in the biofilter produces nitrogen, both of these are the harmful to the growth of the fish. If it is a saltwater tank, then there is a chance of hydrogen sulphide production, which is equally toxic to the fish. Supplying air into the tanks can drive the gases away through turbulence. A trickling filter system is often used for this process. When water is made to flush down from the top of the filter through the plastic media stacked in a column it increases turbulence and contact which helps in stripping the gases.
How Degassing is done in RAS fish farming.
