Tanks smaller than 5 gallons tend not to cycle the way larger tanks do- there isn't a whole lot of surface space that is needed for it to happen properly. The cycles tend not to hold, nor be as stable. You can place a filter media or rock from an established tank in it though to help build up the good bacteria, but if not then that is fine..
The tank will create it's own cycle of sort, and hold beneficial bacteria, but waiting the 6+ weeks that is needed to cycle a larger tank isn't necessary.
What is clear ammonia? Other than the household cleaner? If you are meaning a water conditioner, then yes.. use it.. always use water conditioner each time you do a weekly water change..