I have a 5 gallon hexagon. How often should I do a water change?

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zoomyz34

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I have a 5 gallon hexagon tank with a male betta and 2 cory cats. How often should I do a water change? I have had the tank set up for about 2 months and have not done one yet. I have changed the filter pad though....

any help is appreciated! Thanks a bunch!
 
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