A curved spine is likely one of five things. Old age, injury, water quality, a virus, or tuberculosis.
Injury can pretty well be ruled out.
Water quality is something you would know, but if you change the water often then you could rule out nitrate buildup.
Old age and sickness are left.
What kind of setup do you have? Treating with antibiotics would be a good start (at least it wouldn't hurt even though if its just old age it won't help). You could get a bottle of maracyn plus pretty cheap. But if you have a filter and a cycled tank then you might want to treat in a seperate container. As I'd avise anybody with fish, keep your hands away from the water if you have open cuts of any sort. Some fish viruses or bacteria can cause serious permanent damage if it gets in an open cut.
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