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Sponge Filter for 20 Gal Long


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On my 29G I run 2 large ones.  I mean, it's a sponge filter and you're going to see it. If you're fine with that then I would just use the biggest one you feel like using.  In general with most/any "long" tanks, having one on each side does really help out with flow and circulation.

It's honestly a preference and I would base that choice upon what you want out of the tank.  If you want to have good flow, run 2. If you want to try to hide it, run 1.  The only concern between a 20L and 29G is the vertical height, so you can check the dimensions on the store for comparison.  Depending on the scape as well, making them easy to clean is the other consideration.

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