Neutralizing the ammonia from NH3 (toxic) to NH4 (non-toxic) is the job of Safe, Prime, Cloram-X or similar treatments, but the API test for ammonia will still show the same levels, toxic or non-toxic and not show how much of each. There is a card "Ammonia Alert Card" from Seachem that shows only the toxic ammonia. Petsmart should have it in stock and I would highly recommend having it hanging in a skimmer or other area with water flow to see when/if you have any toxic ammonia. If toxic is showing, add more neutralizer.
Zone 7 A/B
Keep your words sweet. You never know when you may have to eat them.
Richard