04-05-2012, 01:45 AM
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Honestly every tank needs some sort of filter. A good alternative is a sponge filter, as they are pretty gentle in terms of current and offer a very good biological filter.
I would not leave the tank without a filter for a few days, as since it is so small, small changes in the water would be quite large as a whole. Think of it as when you toss a rock in a pond, nothing changes. However, take the same rock and toss it in a small cup, and the water overflows. The rock is the ammonia, nitrites and nitrates. The size of the tank makes it that the overall toxins are more concentrated, and very detrimental for the fish, to the point of death.
I say look into a sponge filter of some sort, especially if your tank is not cycled yet.