No, No, No! If you are seeing ammonia in the water, then you don't have a good bio filter established. You have it backwards with ammonia, nitrite, and nitrate. You can use water changes to get rid of nitrate, but something is wrong if you are showing ammonia and or nitrite. Ammonia gets changed to nitrite. Nitrite gets changed to nitrate. If the ammonia isn't going down, then you don't have any bacteria changing the ammonia to nitrite. That is the reason for the 0 nitrite reading. Without any nitrite, you don't have anything to be converted to nitrate. That's the reason for the 0 nitrate reading. The bottle that you used was bad! You need a new bottle of bacteria, or just wait and the bacteria will come from the air and eventually cycle your tank. This will take several weeks to well over 1 month.