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Wait… you only rinsed one of the canisters? And it had tap water in it for a short amount of time? You are fine. Rinsing flushed a lot of the good stuff out, but the chlorine/chloramine in tap water isn’t as dangerous to nitrifying bacteria as it is to fish gills. In fact, have you ever wondered why continuous drip water change systems can be unfiltered tap water? It’s because the nitrifying bacteria will actually break down chlorine over time. It’s just a fast enough process to save the fish when all that “fresh” water comes all at once during a water change.
And if I’m completely wrong and you have killed all the bacteria, you have a second filter to do the job.
 
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