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post #11 of (permalink) Old 10-08-2011, 04:06 PM
Planted Tank Guru
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Join Date: Feb 2011
Location: Sparks, NV
Posts: 2,585
Sump surging is caused by your pump running faster than you overflow can work or the over flow not having the correct mix of air and water. You can insert airline down the overflow tube to inject air and even out the flow. It should help with the gurgle also.
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