Well, I did a 27g water change Sunday another 27g Thursday and a 30g water change today. My nitrates are down to 20 so I am guessing that unless I did a really big water change now it really won't change much from the nitrate 20 where it is at now. I am guessing that if I go back to my regular 27g water change one time a week I will eventully get the nitrates down to a lower level, right or wrong?