I must agree with CheniseMummy on this one. Stop using the pH down product. Although it will indeed lower your pH it has exactly the wrong effect on any fish. If you keep fish with a reputation for liking a low pH, they really are fish that prefer water low in mineral content. The pH down is a simple acid that will instead drive the mineral content of your water higher while dropping your pH. The test results will simply report that you have been successful in dropping the pH of the tank water. What they will not tell you is that the mineral content of the water has been made even less suitable for your proposed fish. Another impact of simple chemical products like pH down is that the effect is temporary. If you believe that pH is important, you must realize that the buffering capacity of your water will come into play when you use such a product. After you use your acid to lower pH, the water's ability to buffer pH will be called on. If you have a decent pH buffer, as I do, the pH will bounce back by the next day. Then you are faced with repeating the entire pH down addition and an even higher mineral content.
The 1.0 ppm reading of ammonia means that you have a tank that is not yet cycled. Until you have adequate bacterial colonies in your filter to handle the ammonia your fish produce, you will show some amount of ammonia in the tank. I am assuming that you have some fish and will tell you that a fish-in cycle showing ammonia at 1.0 ppm means it is time for a 75% water change. There is an thread here on TFF that will give you some guidance to for doing a fish-in cycle. I have a link to it in my signature area.
If you do not have any fish in the tank, the low levels of ammonia is a good starting point for a fishless cycle. It will give you something to work with until you can find another ammonia source. Sometimes ammonia in a new tank can come from having chloramine treatment in your water supply. My own tap water reads about 1 ppm of ammonia after I use my dechlorinator. I use it anyway for water changes because my fully cycled filters can remove every trace of ammonia in just a few hours. My fish really never see much in the way of ammonia, even with the chloramine that I must work with.
