Bite or something else?

[the_bandit]

Havent seen this mark before. Could possibly be a bite being that I added a larger Tomatoe clown into the tank along with having the devil 3 stripped Damnsel in the tank already.

 

[meowzer]

Maybe it just rubbed against something.....doesn't look like much to me. My yellow tang gets a spot like that once in a while on the back fin...usually repairs in a day or 2

 

[the_bandit]

Ok. Thank you.

 

[the_bandit]

Can you tell me if this is a male or female Sailfin? Had em for over a year and dont kknow which gender it is.