Disease ID?

[Abundant Life Aquariums]

I know this is hard to see... Not the greatest pictures...

On his ventral/pelvic fin. I'm seeing a Lymphocystis type of wound. Any ideas of what might this be?

The tang has spent 14 days in copper at 2.0ppm and is now on his first round of Prazi...

 

[Abundant Life Aquariums]

Here's a slightly better picture.