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I"m not sure about the exact science behind it, but I do know that the ammonia reducer is known to turn the copper (which is a poison in it's own right) more toxic which can result in death for the fish.
^^ This. Mixing an ammonia reducer with copper increases the toxicity tenfold. Seems to be more of an issue with ionic copper (Cupramine) than chelated copper (Coppersafe, Copper Power).