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This can have a number of causes. The oxygen plants are not getting enough sunlight, they are too deep in the water or the hardness of the water is not good enough. Make sure you have oxygen plants at the right depth and that they get at least 6 hours of sunlight a day. In addition, test the hardness of the water. If it is too low, increase it with GH Plus. If you are suffering from green algae that prevents sunlight from reaching the oxygen plants, you must first correct that problem.
