I only do 1-2 water changes per week... about 50% each time in my 265g. In my smaller tanks (55g and 56g), I do one water change per week at 50%. I would never be able to keep up with doing a water change every day, however it is def not bad for your tank or fish. If you think you can keep it up... more power to ya, but I would agree with most eveyone else in that it is not needed. If your fish are looking good and healthy, keep it up and show us some pics too.