I am also running the Sicce 4.0 as my return and the hum is not too bad when the stand is closed ( I am running this in the tank in my bedroom so noise was a big issue for me). The one thing I can't stand is the suction cup feet. As soon as I set the pump down they stick and there is no way to move the pump without the feet popping off so I am sure if I had a solution for this and had all 4 feet on it right then there would be even less hum.
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