Undulated Triggerfish - damaged fin

[leviticus]

I'm considering buying this Undulated Triggerfish from LiveAquaria's Diver's Den. It's upper fin appears torn and there is a white line on it that runs horizontally. Is this a sign of parasite or disease? I called LiveAquaria, and they couldn't provide me with any information.

 

[MnFish1]

I would hope that if the fish had a disease//parasite, they wouldn't sell it. It looks like an injury of some sort - since its impossible to know the duration, its impossible to know whether it will heal

 

[leviticus]

I would hope that if the fish had a disease//parasite, they wouldn't sell it. It looks like an injury of some sort - since its impossible to know the duration, its impossible to know whether it will heal

The Undulated Trigger was delivered 3 days ago, he was already healed before I received him.