is this the sign of fin rot

[Loc Tran]

Hi, I wake up to do water change this morning and spot this Cory hanging on the sponge filter. When I take a closer look, I saw the fish’s fin is missing some pieces. I wonder if this is fin rot or just bite mark. If anyone notice please let me know so I can put a little bit of melafix in the tank. Please and thank you

P.S: I do have a blue ram in the tank with my corydoras

 

[Colu]

Looks like an injury I would add some Indian almond leaves as they have antibacterial and antifungal properties and monitor for now