We begin with a survey of the MFC voltage across the external resistor during the transition between the normal and health-compromised states, followed by the results of interventions that were made. Almost immediately after inoculation, the voltage began to increase exponentially due to growth of the EAB (Figure ). After 3 days, the voltage reached a constant level at 610 to 650 mV. At this time, the external resistor was reduced from Rext=50 kΩ to 30 kΩ, and the MFC remained under flow conditions for 5 days while monitoring to ensure that a steady state was reached. Initially, the voltage was recorded every 4-8 days (Figure ), and the power density and polarization curves were acquired every week. The maximum power density remained relatively constant at P max=370 mW m -2 , and no overshoot was observed (Supplementary Materials, Section S2).