Okay, so I've been dealing with this problem with Voljin for quite some time. When Voljin and Toothless were sharing tanks, they got into a few fights (jumped divider) and a bit of finrot ensued. They got separated into their own 5gallons, and have done better. Since then, Toothless joined Slyph and Kalec in the 20 (jumped the divider and once again picked a fight he lost...Kalec kicked the crap out of him, then he did it again an hour after I saved him. But he's been good since.) Anyways, Voljin and I have been having issues lately.
Maybe a month or more ago, he lost pigment in some patches on his scales on his body. At the time, it didn't look like scale damage, but he wasn't eating. I treated conservatively (dont live near a city with access to any high end meds). Salts, General Cure, IAL, clean, warm water.
So after two weeks of treatment, he started eating again, and the patches turned dark again.
Then they came back two weeks ago, and started to grow despite me repeating the treatment I thought had 'worked'. Only this time he's eating fine, eager for attention, flare's at Tatsu in the tank next door.
So now I'm wondering if it's a marble gene that jumped generations (as far as I know none of Sena's other fish from Aries spawn have marbled).
Here are the pics - and yes, I know the coloration is alarming. But I've looked him over for parasites, fuzziness, anything. It's just a loss or change of pigment. As far as I can tell, anyways, but that's why I'm posting this here...in case anyone else has some ideas.
And please don't mind the 'forlorn' appearance, he's vibrant in his tank, he just does not appreciate the .5 qt I use to better look at my fish.
And yes his lips are white, but as far as I can tell it's only a loss of pigment, they look normal superup close, jut I havent mastered my camera to that lvl yet.