The Planted Tank Forum - View Single Post - How to DIY Divide/Split fish tank?
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Old 06-13-2013, 03:08 AM   #2
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I would use a piece of filter sponge instead. Get one precut into a cylinder or cut a circular piece about 1/2" thick and with a larger diameter than the hole you're filling, then cut a groove along the outer edge so that you can wedge it into the hole.

Not sure if that translated from my mind well enough to be useful. Haha.
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