Black Frayed Fins on Tang

[cayenne]

I have searched for a couple hours and haven't really found a good answer for this one. Attached is a picture of my Fowleri Tang that is currently in QT. It has developed black frayed marks in a couple of places on its fins... I don't know if this is only a coincidence, but this is a day after I added a final 50% dose of Prazipro to the tank.

Is this a sign of physical trauma from the other tang I have in QT, or is this something else I should worry about?

 

[Gwynhidwy]

I would suspect the other tang unless you see other symptoms. I have never seen prazipro do anything like that.

 

[cayenne]

Thanks, the black marks have turned clear now, it definitely looks like a physical abuse issue now...

Will hopefully be placing them in the 300g this weekend