I use the replacement sponges for the nanocube I got at DrsFosterandSmith, mostly because they are black. Just slit a hole in the middle and zip(cable) tie it to the intake cover.
I use the sponges, you can pick em' up pretty cheaply. If you go with them just be sure to clean em' once in awhile (I clean mine every two weeks), as they will collect poo' and can become a source for Nitrates.
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