Like reef-raf mentioned, I would go with centre overflow. I built my overflow and rather than having square corners, I angled them back to the tank at 45 degrees. It has a nicer look then the square corners.
Also during the day, the cleaner shrimp set up a station under it and the tangs visit regularly.
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400g SPS tank + 75 LPS tank
Remote 90g + 65g sump.
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