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A sulfur denigrator might help, and more live rock with the same fish load should lead to a lower nitrate level, as well.
I would keep up dosing with the Prime. 0.5 ppm of ammonia is worrying. Which test kit are you using? SeaChem has (or had) an ammonia kit that would tell you how much of the ammonia is free, and how much of it has been bound by their ammonia treatments.
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Jonathan Bertoni
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