Green terror problem

[Carter020108]

I just got 2 green terrors yesterday but on one of them the end of the dorsal fin is white and frayed it’s hard to get a good picture but does anyone know what it is

 

[Deadeye]

Hard to tell from the pic, but it could be due to aggression or fin rot.
How does the other one look?

 

[Carter020108]

The other one looks fine one is white saum one is gold but I have seen some chasing

 

[Deadeye]

I’d first guess it’s because of aggression from the dominant gt. Keep an eye on it and try separating.

 

[Rocksor]

Aggression… witg only 2 GTs one is bound to get picked on. I would separate now