That frequent of water changes I find to be ridiculous, but many people highly suggest it to keep their levels down! Personally, I would probably do every other day 50% then once or twice a week do a full 100%. Well it just depends... I mean my water for some reason stays nice and level even not cycled.. It makes me happy!(: I could not clean it at all for over a week and still ammonia and nitrites level stay at 0. IT'S AWESOME! (But that's w/ filter!) But for some a day without cleaning their nitrates just start creeping up.