12-12-2011, 08:08 PM
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Suddenly Deformed Neon Tetra
I have a 20g NPT community tank with 10 neons, 8 rummynoses, 5 cory cats, 2 otos, and 1 platy (and who knows how many Malaysian Trumpet Snails). I had 8 cory cats but in the last several weeks, 3 of them turned up mysteriously dead. They were all panda cory cats; my others are fine. Today, as I was cleaning out the latest casualty, I noticed one of my neons hovering at the surface with what looks like a deformed back. It is now isolated but I have absolutely no idea what's wrong with it. I don't know if the same thing that killed the cory cats has affected this neon or not. Its color is good, it just has a deformed back that it never had. Sick Tetra.jpg
I change 20-30% of the water once a week and am using an AquaClear 20 (mature and cycled) filter with a prefilter. Up until a week ago, I also had a small internal filter in the tank as well. My pH is a little high at 8.0.
Any help or insight would be appreciated.