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Manual filter via water changes? A filter is a filter, it does the same job. I hardly ever used one for anything under 10 gallons. However, if you want a good one, try searching around for reviews or continue to wait for people on the forums to suggest one for you. I've used the whisper filters from walmart, and they work okay. I've used my own diy sponge filter, it works too. In all honesty, I just find that it stresses the betta due to limited amount of space. So, if you are to get one, you might want to look into something with very slow and weak water flow, possibly one that is adjustable.
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