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good advice given here - I have nothing to add.

To the OP - just because there are no fish in the tank at the moment doesn't mean that there is no ammonia being produced. While the ammonia the fish excrete directly into the water makes up a large percentage of the total ammonia production in the tank, it is not the only source. Waste that's been collected by the filter (NPT are not supposed to have filters, but many people still run one so I just assmumed) will continue to break down and feed the bacteria colonies.
 
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