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There is really no need to ever replace any of your filter media as that is what holds a good majority of the beneficial bacteria. I do rinse off my sponges in my tank water once a month (when I do a water change) just to get any excess gunk off them. I was changing my filter media as described by the manufacturer's instructions at first, but as I read more about cycling on these forums, I found out that it's not really a good idea unless you want a mini-cycle in your tank.

Also, Koi fish don't belong in a 20G. They belong in a pond. They will outgrow the tank in no time
 
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