Well, my testing routine is like this..
Every week i test for nitrATe, pH, Salinity, calc and Alk
Every two weeks i test for ammonia, nitratITE
Some people might say not to test so much, but i like to be in control as much as possible and constantly monitor what is happening in the tank. That way, i will hopefully notice when something goes a stray...
And i dont test for at least 48 hours after a water change, this gives all the water a good chance to mix in...
Niko