I got my tank all plumbed up and ready to run Fri. I bought this stuff second hand from a guy who had never filled the tank and the pumps were still in box. I found the original recepit from July 2010 where he had purchased 2 Quiet One 9000s from DrsFsterandSmith.com. I plugged the first one in and it rattled like crazy and seemed not to flow any water. So, I read on the net a little about how ppl had gotten bad pumps. Unhooked it, put the other 9000 in the tank, turned it on and it rattles and bangs and turns on and shuts off. Anyone know what may be going on? Or am I missing something?