need 18" sump idea

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hey guys,
i want to use a container to make a refuge under my tank. the problem i am facing is that there isnt much room beneath the tank. i only have 18" of width to work (i have a 47 gal column tank, sams stand as 30 oceanic cube) with and the standard 10 gal/20 gal is 20" long. i am thinking of using some sort of rubbermaid container but i have no idea which type and where to search for them (the ones that can hold water without bowing). i also considered buying a used wet/dry and converting it. hopefully you guys can give me some ideas.
thanks.
 
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