My 90g is equipped with a 6x6 corner overflow and I was able to install a durso standpipe. It's small though. Only 1" pipe into 2" bulkhead. It works fine. I did have to "shorten" the T and the elbow to get it to fit. There should be no problem acceptig return flow from a Mag 12. I'm using a "Quiet One" pump. Similar flow rates I believe.
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