[bigal221]

ok i have a 14 gal. tank and it has been set up for 3 months. i had a total of 9 fish but over the first three days 5 of them died. i bought a water test kit and found out that my nitrate levers are very high. i have changed my water on a daily basis for 1 week and there has been no change in the nitrate levels. How do i lower my nitrate levels.