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I am certainly not the fish expert here, but from all I have understood with the fish I have kept, at some point you just have to let the tank cycle. The more water changes you do the more you will slow down and inhibit the cycling. And if you use a water conditioner, you may remove all the ammonia, but then the tank will never cycle.
Goldfish are pretty hardy little critters. He may be fine. But the more you mess with the tank, the longer it is going to take to get a nitrogen cycle established.
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