Never used aquarium systems fast test - but i highly doubt the result.
Basically you should never see ammonia except during 2 conditions - curing new live rock, and after a major catastrophe. Ammonia is quickly used by a variety of algaes, and is converted by the nitrifying bacteria to NO2 then to NO3. It's the first stage of the nitrogen cycle - which is why the result sounds erroneous. We'd expect to see NO3 and PO4, but ammonia is an unlikely find.
If you did have ammonia in your tank - you'd see corals receeding/dieing quickly and an outbreak of green water, and hair algae. Not the algae your fighting.
Andy
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