Quieting single pipe Durso overflow?

[snowhite]

Following up...

Bought the stuff I needed and initially put the over-the-back return together Friday night. Messed around with it and let it run overnight, tweaked it some Saturday morning and I'm happy with the outcome. I ended up taking the downward elbow off the Durso and am letting it emergency overflow into the large side hole in it. Seems to make less noise that way from a slight trickle than going up and over with the elbow on it.

Only noise is the faint sound of the pump. I'm sending the Hydor return pump back and went with a Simplicity 2100DC 2100gph that a LFS uses in the tanks they build. It's adjustable with 10 steps and pleasingly quiet for just a little over $100. I'm running it on 6 lights so just a bit over 1/2 speed.

 

[snowhite]

Everything's been running for a week now. Happy with the noise level of the Simplicity 2100DC pump. I'm running it a bit over 1/2 power and everything seems consistent. Haven't needed to adjust anything in a week.

Long term I could see moving up in size on the return plumbing when I swap to a new sump in 3/4 months in preparation of starting to add anemones which is the overall plan for this tank.