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)?
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.