Cardinal Tetra Curved Spine, Not Eating

[RAvirani]

Hi guys,

I have a cardinal tetra who has a curved spine. It had actually had a curved spine for a few months now, but now it seems to swim very weirdly. It almost seems as if it doesn't know what it is doing. I normally feed it tropical fish flakes or freeze dried blood worms, but now when I put them in the tank, she won't eat. This seems to be a problem with only this tetra. We have a few other tetras that are acting just fine. The fish seemed to have fin rot a few weeks ago so I treated it with melafix and all signs of that have gone away. Does my fish have some kind of disease and if so what should I do to treat it?

Thanks,
RV

 

[RAvirani]

Video

Here's a video.

 

[anteatergoanna]

When you noticed it a few months ago, what treatment did you do?

 

[RAvirani]

I treated with melafix and aquarium salt a while ago when the fish had finrot and ich respectively, but I haven't done anything else apart from that.