How do I build a 20g long sump?


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I have a 20 gallon long glass tank that I would like to build into and use as a sump for my 55 gallon reef tank. Does anyone know where I can get baffles for this? How should I configure the baffles? Does anyone have a diagram? I want to put my mag 9.5 and a skimmer in this sump. I also want to make a refugium out of part of it. Thanks.