Nitrite levels always at the end of the safe zone,nitrate levels always on the safe side (perfect). Even after water changes taking out 20% some times a bit more the levels are always the same. I test with strips and a kit, they are pretty close in what they read. I am not complaining with the...

Hi:wavey: I was wondering how often i should change my 29 gal tanks water? and how much do i change? the tank has been up for a month and it just finished cycling. i just added my 2 clowns yesterday. when should i change the water?:read: