I have noticed in the past few days that my filter is causing a low
buzzing sound from vibrating in the tank. I have one of those internal
filters. I don't know what it is but sometimes you can it vibrating
against the tank and you can feel the vibrations if you put your hand
on the tank glass. I was just wondering if that is really bad for the
fish? I just spent 20 mins moving the filter around moving it's cable
around so it doens't touch the lid etc but I can't make the sound go
away. usually it's because the power cable is touching the lid and
causing the lids to knock together but not all the time.