so is the black plastic pipe extension what they are referring to as a stand off? if so its not needed and wont make much odds to the noise of the filter. Id recommend some duck tape \ tank tap over the top edge and down the back of the tank covering the main contact points of the filter with the tank as a more permanent solution to sound deadening from the vibration.
So is there still noise when you lift the filter a bit by hand? if so try pressing and wiggling and adjusting the flow control, also check the lid of the filter isnt rattling on the body.
So is there still noise when you lift the filter a bit by hand? if so try pressing and wiggling and adjusting the flow control, also check the lid of the filter isnt rattling on the body.