whats the smallest filter i can use for a fish tank?

  • Thread starter Thread starter Growlithe W
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Growlithe W

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I have a corner box filter in my 10g. I have an empty 2.5 gallon and im planning on putting a betta in it eventually. I dont wanna use a corner box filter because its gonna take up a lot of room in that small tank. So what other filters are tiny enough to fit in a 2.5g? Thanks.
 
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