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Tank cycled.. i think?

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For weeks my ammonia and nitrates were 0 and nitrites were spiked. I was doing 50% water changes daily and increased Prime dosage slightly to keep the fish safe.

3 days ago there were nitrates showing up on the test for the first time. Since then, nitrites have gradually come down and today they were 0. Yay!!

However, today I also detected some ammonia for the first time (0.25). Note that my tap water has between 0.25 and 0.5 ammonia.

Do I need to dose Prime every day if my tap water contains ammonia, or only when doing a water change?
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