HUGE clear bubble over the eye

Kigs

In Memoriam
Should've posted it here first instead of in the Fish forum - sry for the double post mods;

Borbonius I've had for almost a year now (healthy throughout the whole time, no problems) all of a sudden became extremely reclusive for couple of days. I thought not much of it till I saw it today.

It has a huge bubble over one of its eyes - clear, but almost 2x ~ 3x the size of his good eye. Is this same as a pop-eye? *Only reason why I ask is because I can see its eyeball(?) clearly inside the double layer of bubbles at a normal size.

I can't think of what could've triggered this... and I'm kinda sick to my stomach about it since I've had this fish for so long - any help would be appreciated...
 
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