FWIW I have found that even with the Herbie overflow I cannot push a lot of water back through my return as I get to much splashing noise from the extra water dropping into the overflow (only about a 3" drop to the water level).
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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