You're in Sh. Park, right? Do you folks get your water from Edmonton, or do you have your own water treatment plant?
If Sh. Park's water source is Edmonton, the water is treated with chloramine which is a compound composed of chlorine and ammonia. It's much more stable than chlorine. Prime will neutralize the chlorine, but I'm not exactly sure what it does to the ammonia. Prime might change the ammonia to ammonium which is not harmful to fish. But I don't know if ammonium will test positive for ammonia. I suspect the test kit is reading the ammonium as ammonia, though.
What do you have in your tank besides water? (Sorry for the dumb question.) What did you treat the water with?
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