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Discussion Starter #1
Do I need to run a filter on a 6.6 gallon tank or can I just do water changes?
 

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You don't have to have a filter, but it makes it nice. A sponge filter is generally very quiet and doesn't disturb the water too much, if you decide to use a filter.
 

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Discussion Starter #3
I don't know what a sponge filter is.... do you have a picture?
 
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