I've been running the Little Giant 4 MDQ-SC on my 150 gallon FOWLR for almost two weeks now. It was louder than I expected when I first fired it up, but now it runs extremely quiet and efficient. This is the first external pump I've ever used, and was concerned that the noise would be too much for me. It quieted down a little after the break-in period, but the noise was still noticible (as in the tank sounded like my dishwasher). I did a little research, and found that folks have had luck by placing a mousepad under the pump. That's exactly what I did, and it made a HUGE difference in silencing the pump. I can't hear it now unless I open the cabinet. Make sure that the pump is screwed onto the stand, and you should have no problems.
