Tropical Fish Keeping - Aquarium fish care and resources

Tropical Fish Keeping - Aquarium fish care and resources (http://www.tropicalfishkeeping.com/)

- Tropical Fish Diseases (http://www.tropicalfishkeeping.com/tropical-fish-diseases/)

- - Neon Tetras (http://www.tropicalfishkeeping.com/tropical-fish-diseases/neon-tetras-83277/)

I recently set up a quarantine / hospital tank. It is a ten gallon, and has been up since Saturday. Everything is brand new. However, the filter media is from a long-established and healthy tank. I am currently using it to quarantine ten Neon Tetras that have been in the tank since Saturday. I lost one today. The others are exhibiting rapid respiration and appear distressed. I'm at a loss for causation. Water parameters are as follows:

Ammonia: 0
Nitrite: 0
Nitrate: -5 ppm
Temp: 78 (F)

I have reviewed the"Disease"section of this forum but wasn't able to determine what was going on with my little guys. Any insight greatly appreciated.
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You should take the carbon out of the filter until it clears up. You need the treatment working through the filter and not being broken up by the carbon. I had this happen in my 10 gallon a while back. I used the treatment for ick when I noticed that one had some on its gills. Treated as noted on the bottle and it cleared up. Did a couple of water changes of I believe 50% and filled the filter back up with the carbon. Haven't had a problem since. Hope this helps.

No carbon on the filter, purely biological. No other indicators of Ich yet but I'll keep my eyes peeled for that, thank you.
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why did you quarantine?

New fishes from the LFS.
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