12-10-2009, 10:40 AM
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I concur with 1077 that nitrite, not ammonia, should be your guide.
As you have ammonia in the tap water, using Prime as your water conditioner will detoxify it by changing it to harmless ammonium. Tests will still show it, the API as most (but not all) test kits read ammonia and ammonium together as "ammonia" but in ammonium form it is not a problem. Nitrosomonas bacteria use ammonia and ammonium. It is the nitrite that will tell you when the cycle is complete, and a 50% daily water change to keep nitrite below .25 is recommended.
From what you've told us you are always going to see ammonia readings, but the above applies.