Lost two fish all of a sudden. My nitrites up?

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catkramer2008

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I have a newer tank. My water was fine, had it tested and tested it myself. I had 6 mickey mouse platys that were active and everything was great. I added a some mollies and a few catfish (55 gallon tank) and then I have been watching them since I added them this morning. My amonia is great, my temp hasn't changed, everything is fine. But I lost one mollie and one mickey mouse platy. I think all others are accounted for. ( i had 15 fish total in the tank). I found them both back behind my plants right under where the filter is. I am not sure what happened. I just dug them out and tested the water again, and the only thing I can figure out is my nitrites are barely elevated. Just up to .5. Is there a way to get them back down? Is this what may have done these two in? I am afraid to go to bed and wake up with 13 more dead fish floating. I am not sure what happened.

I am taking them back for replacements as they are still under the 14 day guarentee, but I want to make sure there isn't something I can do to prevent more deaths.

thanks
Awesome! I was starting to worry. What causes the nitrites to go up to begin with?
 
Your tank does not seem over stocked, the fish you have are hardy fish that can live with little high nitrite, If your tank not already fully cycled the problem may be adding relatively big number of fish at one time, over feeding may contribute to the disaster. Do 30% water change and watch.
 
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