Reef Supplies sells one. I have them installed on two different client tanks - one is about 130 gallon, the other is about 240 gallons. The overflow works well for these tanks with a Herbie-style drain installed. It takes a bit of fine tuning to make them quiet when there is a lot of flow going through them. The bigger tank has a Quiet One 6000 return pump for flow reference for you.
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~ Mindy
SPS fanatic.
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