I installed a MAR 3181 chaeto reactor about 2 weeks ago and the pump appears to have failed. I've powered the pump off and on several times. I know the pump is getting power because the controller LED is on, but I do see it blink off every 17-18 seconds. I did the "tunze bounce" to remove any air in the pump. I ensured there were no incoming or outgoing flow obstructions or crimps in the hoses. I also soaked the pump in a citric acid mixture for an hour and tried again. Suggestions?