so I get the appeal of a completely quiet aquarium... but I actually find the sound of bubbles to be an appealing white noise ( like those relaxation sound tracks, people pay good money for ) now the sucking noises the hang on back filters make, when the water level gets too low, I don't find relaxing, and that motivates me to keep the tanks topped off, even if I am busy ( only requires moving the fill hook to the offending tank, and the push of a button to fill ) But. I find the sound of the bubbles on a properly filled tank, to be a soothing sound...
