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What size filter is recommended for a 20gal tank that has 9 fish and 1 snail. Trying to figure out a process. Tank gets cloudy a week after 25% new water added and it doesn’t go away.
 

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Hi Dla, what kind of filter do you have on there now? You can use any type of filter rated for a 20 gallon tank. I usually try and get one that is rated higher than my tank size. It usually depends on how much money you want to spend and how often you want to clean the filter.
The question I have is why your water is getting cloudy if you have a filter on it and you are doing weekly water changes.
 
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