Hi - just two things
Firstly: cpr153z, There should be (ideally) no ammonia or nitrite in your tank - these are the most toxic of the three you are testing, ammonia particularly so. You will only know that the bacteria have taken hold (reached equilibrium) by monitoring the levels of ammonia, nitrite and nitrate over a couple of weeks. The ammonia should fall to zero first, followed by nitrite.
Secondly, in the UK at least, allowing your tapwater to stand to remove chlorine is no longer safe. Some water companies have moved over to chloramine, which is a much more stable compound, isn't lost on standing, and is toxic to a range of aquatic life (Edinburgh Zoo lost a fair amount of stock through this change). There was a thread in the Vivaria forum about this a while back, but to summarise, products like Aquasafe can clear chloramine, so if in doubt, Aquasafe your tap water.