Are you sure it means you can adjust the amount of flow? I think it just means that the ball-and-socket design allows you rotate it whichever way you want to adjust the direction of the flow. As far as I know, the Koralias do not have a way of adjusting the amount of flow. My Koralia 4 doesn't.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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