No, I was just curious to see what the base levels for the test were (sometimes, small ammonia measurements come from the test itself rather than the tank water - but then you would have seen the same with the rain water).
Having said that, if your tap water shows more ammonia than the tank water, water changes won't really help with the ammonia levels.
Did you ever get a nitrite spike the past month? If so, it looks like the cycle is well on its way and I would assume the ammonia levels will get lowered on their own, eventually (though they will rise a bit every time you do a water change).
If you haven't seen a nitrite spike yet, that means the cycle hasn't really started yet (and the nitrates come from the tap water as well). In that case, you want the ammonia (or even higher) to get the nitrifying bacteria.
