gravel color choice and water circulation

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I've seen people recommending to use those quick release couplers.  If it works well I might look into it as well.
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I'm not sure about that as long it produces a low press area to where its able to draw water from the tank. The little brass eductor I can get is only 6 inches long tops and is made for that purpose. I'm not sure if I ever came across quick release couplers its worth a shot to try out.