Did some experimenting tonight and found if I changed the drain size from 1 1/2" to 1" in the overflow and added a tee to the bottom of the drain, it is quiet as can be. The water level in the back is set just below the top of the emergency drain. The only thing I can hear now is the Eiheim pump and it is very quiet.
So we drained the freshwater and started to put the light rack back together. With any luck I should be starting to put saltwater in it tomorrow night.
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