Unfortunately for cube aquariums, there isn't as much space for a large sump as under a rectangular aquarium. Assuming that it will have a submersible return pump, try to use the largest cube shaped container possible that still gives some head room/working room.
Just for fun, here are suggestions for the Sump/Refugium that make maximum use of the available space. I suggest leaving the sump open without baffles and hanging the return pump near the water surface. This gives 4 valuable benefits:
1) the entire sump becomes the top-off reservoir rather than one small partitioned chamber
2) the return pump cannot pick up sand when it's hanging near the water surface
3) in case of clogged overflow the return pump won't pump the sump dry and overflow the display
4) the entire Sump can be a Refugium with a full sand bed and Macroalgae farm.
A skimmer, if used, can be placed on a pedestal or hung on a shelf to allow for proper height adjustment. This leaves the sand bed unobstructed for maximum biofiltration. Macroalgae can be kept clear of the pumps with secondary strainer baskets. The drain pipe, if turned up at the end will not stir up the sand bed, or alternatively can be fitted with a filter floss bag.
Aloha
Edited by Mark Peterson - August 11 2014 at 6:37am
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