Nice build. I had a question did you ever get your overflow dialed in.
I have glasscages a tad smaller than you it's 72x30x30, so ~280 gallons. I have two reef savvy ghost over flows on it. Originally I plumbed it with drain lines and an emergency in each overflow box. The only issue was the flow in the tank made the two overflow boxes have a different amount of water at different times which lead to sucking. I had gate values on all the drain lines but still couldn't dial it in with the amount of flow in the main tank. So it was modified to basically run a herbi flow on each one. So just a suggestion if you have or are having the same issue.
I'm running three mp 60s, two on one side by my SPS rock work and one on the other side. I have two returns that are split into two with random flow generators on each one.
Great build though.
So it isn’t perfect but it’s much quieter. I have messed with it for hours, I will say once I pull the “U’s” out and put different length pipes in its silent with a herbie setup.
When the flow really gets high with the surges from reef crest it sends more water in the overflow causing the secondary to make noise again, like you I’m also running the random flow generators.
Kind of frustrating but I’m not going to mess with the tank for a bit and let everything settle in after the chaos of a tank transfer.
Do you have a build thread?