This is the situation: 10/17 moved complete tank, water, sand , fish, rock. (sorry, I cant tell you anything about the history of the tank) The following are my test: 10/21 PH 7.8, Am 0, Nitrite 0, Nitrate 100. On 10/24 PH 8.0, Am 0, Nitrite 2, Nitrate 100. On 10/25 I did a 30 gal water change...