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flow rate

  1. Is flow rate too high?

    Beginner Freshwater Aquarium
    Hey all, I just upgraded filters for my 56g column from 2 fluval U2 to a Fluval 305 canister. I'm wondering if the flow rate is too high or if there's an "optimal" flow rate? The box says 260 GPH (185 GPH filter circulation). Above the outtake, sometimes I'll notice a little water funnel here...
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