My aquaclear 20 is virtually silent. Try putting more water in your tank so the distance from where the water falls between the filter in the tank is shorter. This gets rid ofthe waterfall noise. Also if it is making a vibrating noise against the glass put some folded paper between the filter and tank to dull it out. If that doesn't help then i would return it, but in general all filters make some noise
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-Julia
"it is impossible to convey the life-sensation of any given epoch of one's existence--that which makes its truth, its meaning--its subtle and penetrating essence. It is impossible. We live, as we dream--alone..." The Heart of Darkness
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