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Discussion Starter · #1 ·
I cleaned my filter media using tank water and poured out the dirty water in the filter. 2 days later, my nitrites are at .5 ppm. Does this mean my filter bacteria are dead?? If not, is there something I should do (other that stop feeding for a couple days)?
 

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What kind of filter? Did you refill with tap water? How long has the tank been running?

Did you add more fish?
 

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Discussion Starter · #3 ·
It's an fx6. I was careful to rinse the media only in dechlorinated tank water. My tank has had fish in for between 1 and 2 months, and since my fishless cycle I have not seen any nitrite. The last time I added new fish was 2 weeks ago.
 
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