I drilled the back of my Marineland 60 frameless cube in the overflow area and used the 2 holes to run a herbie and the drilled hole on the back wall for the return.
On my 220 I'll be removing the corner overflows and drilling holes for a "ghost" type overflow and capping the 4 holes on the bottom of the tank.
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Marineland 220, Marineland 60 Cube
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