Custom built sump. Both drains enter on the right. Flow through 4 filter socks. Bio media is under the socks. Then one return pump. The right sump is connected to the left to maintain the water level. The left sump is sectioned in half, one side is a refugium that is fed by the other return pump in the other half. Right now I am probably running around 2000 gph through 325 gallons total.
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