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Are you saying that with the valve on the siphon wide open, there is too much flow for it to handle so a lot of it is going through the open channel?
If this is the case, then the only 2 options that I can thing of are:
a. Change the siphon pipe to something larger (would be hard to do as the smaller bulkhead will still limit flow), or
b. Reduce the flow from the returns.
Why are you running two return pumps?
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120G Mixed Reef, 28G AIO zoa/pipefish tank
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