Description
Carbon dioxide levels of below 10mg/l are thought to be well tolerated by fish. Although sensitivity to the gas varies between species. The level of CO2 in the water varies with the respiratory and photosynthetic activity of animals and plants in incoming water. The level of decomposition of organic material in that water . And the respiration of the fish themselves. CO2 can build up to significantly high levels in systems with large numbers of fish. And relatively slow water turnover.
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