The pump does now have three months transfer their service. The noise level is ok, but it was in pump operation after a few days a little louder (a slight buzzing sound), so they can not be called a "silent" in any case. Since then, the sound has not changed anymore. If you are the aquarium in a living room, which is in our opinion not a problem. If the aquarium, however, are in a bedroom, it might interfere. We have purchased the pump, because we realized that the O2 content at night fell in the aquarium at a critical level. Since the pump is installed and (only) run during the night, this problem has done in our 200 liter tank. If the fish is better, you can bring the "victim", I think. Otherwise, the pump is well made and the supplied accessories are available for the price ok. We have suspended the pump by means of a leash, so she really does not bump and could generate vibrations. That record the costs noises are exclusively linked to the pumping operation of the device and the effervescent sound in the pelvis (which of course there are) due.