12-21-2012, 08:39 PM
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I'm not sure what this issue is, or what causes it, but I have had fish get it. Something to do with the swim bladder I believe, though it can be triggered by protozoan and who knows what else. It may be genetic.
Anyway, the fish is highly unlikely to survive or recover; I have never seen one that did. They weaken further and further until one morning they are gone. Since this is the only fish, there is no problem just leaving it and feeding it as best you can. Who knows, it might make it! In community tanks such fish never recover, perhaops because they can't get food. I just put down an Emperor Tetra last week with this same problem. But I did this because it was wasting away, the other fish were around it, and it seemed best.