Fin rot or aggression?

[BigBearMD]

I’m curious on what you think this is. I placed two clowns, a wrasse and a royal gramma in quarantine 2 days ago. The Royal gramma died overnight the first night. My wife and I first noticed the fin this morning.

 

[DSC reef]

That looks like aggression IMO

 

[BigBearMD]

That’s kinda what I was thinking at first but I’ve been sitting on the couch across the room and I haven’t seen the first bit of chasing today.

 

[Humblefish]

That looks like aggression IMO

+1 The clowns looks very similar in size; possibly you have two females? Whenever I pair clowns, I buy a larger one, and then a baby/juvenile and wait for him to grow up.

If aggression isn't the issue, then I would suspect a bacterial infection: https://www.reef2reef.com/threads/bacterial-infections.191511/

 

[BigBearMD]

+1 The clowns looks very similar in size; possibly you have two females? Whenever I pair clowns, I buy a larger one, and then a baby/juvenile and wait for him to grow up.

If aggression isn't the issue, then I would suspect a bacterial infection: https://www.reef2reef.com/threads/bacterial-infections.191511/

Agreed. These two have been together for over a year. I bought them from the LFS which was rehiring them as the previous owner had to move across the country.

 

[BigBearMD]

Just to update. The fin is healing great. I’m pretty sure this was an aggression issue.

 

[BigBearMD]

A little blurry but you can see if healing on the lower clown.