My sump is out of the cabinet as well for ease of maintenance. I just have my freshwater top off tank in the cabinet. The tank is in the basement and I can only hear it when I'm in the same room.

All good suggestions! thanks a lot!

I am now waiting for a little fishy ball valve to lower the flow from my 1800 gallons per hour pump a bit as it is a little too much for my overflow.

I would love to do this with my Osaka and get rid fo the ugly skimmer on the side of the tank but I have only a very small space in the Osaka cabinet.