It doesn't look very promising in terms of recovery to me either, I'm sorry. Any chance you could get a short video of it? The video upload function on the site doesn't work (
@Fishmanic is there ever a chance of that getting fixed?) but if you upload the video to youtube, you an link the video here!
Other than giving the fish a few days to see if it improves, and if it gets worse, euthanising it, it's also important to see if there's any possible underlying causes for whatever happened to the fish. For that, we'd need more info on the tank please. If you copy/paste and fill out the template below, that gives people a lot more info to see if there are any problems brewing in the tank or stocking that we could advise on.
Tank size:
tank age:
pH:
ammonia:
nitrite:
nitrate:
kH:
gH:
tank temp:
Fish Symptoms (include full description including lesion, color, location, fish behavior):
Volume and Frequency of water changes:
Chemical Additives or Media in your tank:
Tank inhabitants:
Recent additions to your tank (living or decoration):
Exposure to chemicals:
Digital photo (include if possible):