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I have just added a small bubble filter to my tank. It vibrates to generate enough force to push the air through the tube into the tank as most small motors do. I can feel the vibration when I place my fingers on the outside glass of the tank. I isolated the motor on a piece of 4 inch foam and that reduced the vibration a bit but it did not disappear. I suspect that the vibrations are traveling the length of the tube into the water. Will this new vibration harm the fish? Is there a way around this?