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I've been running the herbie on various tanks for over a year now - never had a single problem. In fact the Durso's and Stockmans I've used in the past have been more headaches.
Basically you've got one primary overflow, add a valve (ball/gate) throttle it back so that the water level remains constant. The emergency is just that - in case a snail / caulerpa gets in and blocks the primary. Quiet as anything - only noise I hear is from the pumps.
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