Bio-wheel filter are notoriously noisy. Not as noisy as you probably believe as its an unnatural office noise vs the home. There is no real cure for it. Some make noise more than others. You may tru "widening" the black plastic that holds the biowheel itself. This sometime helps. Be sure not to put too much stress when pullit it outward. Breaking them is a good possibility.
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Member of the AGA (Aquatic Gardner's Association)
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