It's sitting on the top shelf of my desk. This puts it about 2 inches higher than and about 4 inches from the side of my tank. There is nothing touching it. I tried sticking a towel under it but it didnt change and when I pick it up it still makes that same humming sound so now I'm guessing that putting it down on the carpent probably won't make a diference either. My hob
filter is so quite, just wish I could get the airpump quite too.