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I also have a 55 gal, it sits on a stand with an open back with no brace. I built a 10 gal sump refugium. Front doors to narrow to put sump in. I had to put it thru the back. Only one problem, tank to close to wall to slip tank in the back. All I needed was 2 more inches of clearance. I drained enough water out to allow the tank to be inched forward. I was now able to put the sump in and the rest is history.
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