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I would be tempted to euthanise it as it will just suffer, keep an eye on the rest.
One out of how many? are you feeding good quality food that has not been hanging around for ages?
Fish suffer from TB which causes spinal deformity, that and the lack of proper nutrition are the two causes of bent fish.
You still need to do partial water changes regardless of dumping chemicals into the water, it is a fact of life if you want healthy fish.
On a more serious note, Fantails and other man made breeds of Cyprius are prone to swim bladder problems as their stomach cavity is squashed, this...
This is just too funny to be true, a fish whisperer? [IMG]