A cochlear or vestibular implant arrangement comprising: a cochlear implant electrode array (110, 305) with electrode contacts configured to be implantable into the cochlea (104, 201, 301) or a vestibular implant electrode array with at least one electrode contact configured to be implantable into a vestibular system of an implanted patient; and an inner ear fluid circulation system comprising: an implantable circulation pump (306, 506) having a pump inlet (307, 402, 405, 507) and a pump outlet (308, 403, 406, 508) both in direct fluid communication with inner ear fluid of an implanted patient, and configured to drive the inner ear fluid in from the pump inlet and out through the pump outlet and wherein the pump inlet and outlet are arranged to effectuate inner ear fluid flow; a pump controller (309, 509) coupled to the circulation pump and one or more sensing elements for measurement of one or more fluid conditions within the inner ear of the implanted patient; wherein the pump controller is configured to control operation of the circulation pump as a function of the measured one or more fluid conditions, wherein the pump inlet (307, 402, 405, 507) and the pump outlet (308, 403, 406, 508) are located on an outer surface of the electrode array (110, 305) such that the pump outlet and the pump inlet both are within the cochlea (104, 201, 301) or vestibular system, respectively, when the electrode array is implanted in the patient. a cochlear implant electrode array (110, 305) with electrode contacts configured to be implantable into the cochlea (104, 201, 301) or a vestibular implant electrode array with at least one electrode contact configured to be implantable into a vestibular system of an implanted patient; and an inner ear fluid circulation system comprising: an implantable circulation pump (306, 506) having a pump inlet (307, 402, 405, 507) and a pump outlet (308, 403, 406, 508) both in direct fluid communication with inner ear fluid of an implanted patient, and configured to drive the inner ear fluid in from the pump inlet and out through the pump outlet and wherein the pump inlet and outlet are arranged to effectuate inner ear fluid flow; a pump controller (309, 509) coupled to the circulation pump and one or more sensing elements for measurement of one or more fluid conditions within the inner ear of the implanted patient; wherein the pump controller is configured to control operation of the circulation pump as a function of the measured one or more fluid conditions, wherein the pump inlet (307, 402, 405, 507) and the pump outlet (308, 403, 406, 508) are located on an outer surface of the electrode array (110, 305) such that the pump outlet and the pump inlet both are within the cochlea (104, 201, 301) or vestibular system, respectively, when the electrode array is implanted in the patient. an implantable circulation pump (306, 506) having a pump inlet (307, 402, 405, 507) and a pump outlet (308, 403, 406, 508) both in direct fluid communication with inner ear fluid of an implanted patient, and configured to drive the inner ear fluid in from the pump inlet and out through the pump outlet and wherein the pump inlet and outlet are arranged to effectuate inner ear fluid flow; a pump controller (309, 509) coupled to the circulation pump and one or more sensing elements for measurement of one or more fluid conditions within the inner ear of the implanted patient; wherein the pump controller is configured to control operation of the circulation pump as a function of the measured one or more fluid conditions, wherein the pump inlet (307, 402, 405, 507) and the pump outlet (308, 403, 406, 508) are located on an outer surface of the electrode array (110, 305) such that the pump outlet and the pump inlet both are within the cochlea (104, 201, 301) or vestibular system, respectively, when the electrode array is implanted in the patient.