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Just finished setting up my 90 gal reef ready and my refugium under the tank and the refugium keeps gurgling at the bulkhead on refugium and is very loud. I have it plumbed with a straight down PVC and was wounding if it needs to have a 90 installed. The pump is a magdrive 9. When I valve the return down the gurgle stops but doesn't have much pressure. The refugium is a sealife 100
 

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never run a valve on the drain you need to control the amount of flow through your return.
what size pvc are you using for your drain?
(it would be best to use 1 1/4 inch flex tubing for your drain)
what size bulkhead?
can you take a picture of your drain?
 

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I had some issues with really loud gurgles and I adjusted the output from the return pump located in the sump. Once I got the amount of flow going at the rate the box could take down equaled out the insanely loud gurgling stopped.
 
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