Did you test your tapwater before or after you added the Aqua Plus? (On a side note, if you're running a skimmer you might want to look at a different dechlorinator. Aqua Plus has a lot of herbal extracts in it that tend to make skimmers overproduce when it's first added. I like Seachem's Prime.)
Generally fresh tap water won't read any ammonia, but once the dechlorinator/dechloraminator touches it, the chloramine molecule is broken into chlorine (I think?) and free ammonia. NOW that ammonia will show up on a test.
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