I'd say more like 50% per week is a more realistic amount to go by, but we won't really know what the 'magic number' is until you test for nitrAtes. As long as the regular water changes are keeping nitrAtes at or below about 20 ppm at all times, you should be set. Always be mindful of tapwater nitrAte levels which, if they are present in any significant amounts, could drastically alter the way you should be maintaining your water changing schedule.
And just to clarify, the 'extra' filtration you mentioned definitely doesn't hurt---especially with a large, messy fish in a relatively small tank. However, it will not get rid of the nitrAtes. That needs to be done via water changes.
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