What is this??

[JurisHP]

Can anyone tell me what this is and what I can do about it?

[snorvich]

Pictures are not closeup enough. Could you describe exactly what you are seeing? Thanks.

[ThRoewer]

How long do you have this fish?

To me it looks a bit like this fish had pop-eye and the stretched skin hasn't fully retracted yet.

[Ginger bay]

Looks like pop eye.

[JurisHP]

I've had him for over a year. It looks like a bubble -- actually like a bubble filled with Mercury. I can't seem to get any closer shots.