I have had this filter 2 times in the past and in the current one I all tend to make the same noise. I've seen several reviews on here that seem to have the same problem and they keep saying that the motor sounds like it's gone bad when actually it's not, that loud loud noise like Engine noise is actually the cover vibrates a lot, which makes people think the engine is bad, I always have to take off the cover at night because the noise does not let me sleep. In general, the filter itself is a really good filter, the design could be better because the cap doesn't fit properly, and because the motor is doing its job, it makes the loose cap vibrate, which makes the sound of a bad motor. when it doesn't really exist. would recommend if you put the fish tank in the living room or anywhere other than the bedroom because this sound will keep you awake trust me.
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