High copper levels can be toxic to fish. Check with the test kit. Un-plug the control panel from the electrical supply if the copper level is over 0.25 mg/L (ppm). The control panel can be turned back on once the copper level drops below 0.25 mg/L (ppm). Lower the ionizing dosing level to maintain a copper level of 0.25 mg/L (ppm) or less. Water changes can also be conducted to reduce the copper to the proper level.
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