Im by no means an expert however unless you are doing water changes that large and that often to treat some type of "situation" i would only recommend 10-15% once every week or two. Depends alot on your bio load and the shape of your water. If you are constantly battling nitrates/phosphates being high then yes doing more water changes is better. However to me that seems like quite a bit of overkill.
Small often water changes shouldnt do any harm but like i said unless you are treating a specific issue it seems to be a bit of overkill.
PS. Damn thats dedication
