This is a link to the forum http://www.monsterfishkeepers.com/forums/forumdisplay.php?35-Freshwater-Diseases-and-Health-Issues I hope you find your answer there. I think 8 months of this is long enough. I wouldn't wait much longer before trying some form of medication. In the meantime I would up the water changes to 50% weekly. The increase in water change may not be the cure but it will still provide the Jag with good water parameters to recuperate in.Thanks!!! I'm new here so I haven't seen it.
Jaguar Is one of the toughest fishes so I think he'll get over it (I hope).
And thank you all!