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After the siphon starts, the valve on the siphon is closed, which raises the water level in the overflow. The water level is raised till water just flows in the open channel. Generally, the water level will be above the centerline of the elbows, and usually around the top of the elbows. (down turned elbows.) Sorry for the delay. I saw this last night, and spaced it.....
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"Things should be made as simple as possible, but not simpler." (oft attributed to Einstein; most likely paraphrasing by Roger Sessions; compactly articulates the principle of Occam's Razor)
Current Tank Info: 325 6' wide Reef
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