I've got a couple questions. First, I've only been doing this a couple months but since the time my tank was cycled when ever I test the ph, amonia, and nitrites their always the same. Amonia and nitrites are always 0 and the ph is always 8.0 (I have two tests for ph. One says 8.0 and one 8.4. They are consistent and with in the acceptable range so I don't mess with it). Can I ever just stop testing for these? Maybe at least until I experience a problem? My second question is more just a poll to see when you guys do your water changes to bring down your nitrates? 5, 10, 20, 20+ppm?