Couple of things Kel.
Whew ok LOL that wasn't clear in your initial post, and I couldn't tell if there was a source of ammonia in the tank. The fish are your source of ammonia, as its a product of their waste: they both secrete it (as we do when we pee) and its also a part of their respiration process. The decomposing food can also be a source if you are not cleaning the tank and getting it out.
I wouldn't add any ammonia; as you've read previously its toxic to your fishies. Its generally used when people do a "fishless cycle", which is when the nitrogen cycle is done with no fish in the tank. When cycling WITH fish, you have to keep on top of those ammonia and nitrite levels, and do lots of water changes to keep the water toxicity from killing the fish. Of course, you're pulling out the stuff the bacteria need to grow and reproduce, so the cycle can take a lot longer to finish.
The whole cycle thing with fish is a hard choice. You need the ammonia and nitrites to feed the bacteria and grow the colonies, but you need a lot of bacteria to keep the ammonia and nitrite levels down. Sort of a catch 22 you know? I admit tho, I don't do the fishless cycle, although I may try it with a new tank I'm setting up. And to put it bluntly, I've been nothing but lucky in not losing any fish when I did that. Then again, I do water changes 2-3 times a week and that may have played a small part.
I strongly suggest (if you haven't already) that you purchase an ammonia and a nitrite test at the very least, and test your water daily at this point (that will become unnecessary once the tank cycles; I test once a week now). If you see any ammonia, and if the nitrite levels become high, do a partial water change ASAP to dilute those toxins. A nitrAte test would also be a good thing to have, as thats the end result of the nitrogen cycle; generally, if you have no levels of ammonia or nitrite, and levels of nitrAte, you know the cycle has completed.
Lastly (god, this has become a novel hasn't it? LOL sorry). Your tank will mini cycle everytime you add fish. Why? You are adding more sources of ammonia! More fish poo, more fish breathing in the tank, more food added. Don't be surprised if you get a bacterial bloom when you add. Its one of the reasons its suggested to stock the tank in stages; so the ammonia levels do not become too high, and the bacteria have enough time to keep up with it.