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Most HOB overflows cant handle a lot of flow (Lifereef being the exception). They cant actually handle the 600 GPH "rating". As others have already posted, to surface skim, the water must "fall" into the overflow. The water level inside the skimmer box must be below the bottom of the teeth. A too tall baffle or standpipe on the drain side can also cause this. If the drain piping is not restricted, cut back your return flow. Dial it back on the output side.
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