I do not hear the return pump at all. I hear the water falling down in the filter bags, but I‘m working also on this topic. The pump is not fitting into the connectiion from the aquarium. I bought the following item - silicon anti vibration tube (
http://royalexclusiv.net/en/accesso...tion-rd1-8-10m-vs08-rd3-speedy-65-75-80w.html). The fitting red is connected to the pressure side of the pump. To connect to the aquarium tube I made a connecter out of PVC-U. I added two pictures from the sump and the connection.
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