Yellow Coris ID R pectoral fin issue

[K9Fish]

Please help ID the issue with my yellow Coris on his R pectoral fin. This was sudden onset came on last night. Looks the same today. The last 20 seconds of video are the best. Thanks.

 

[K9Fish]

A still pic.

 

[vetteguy53081]

Please help ID the issue with my yellow Coris on his R pectoral fin. This was sudden onset came on last night. Looks the same today. The last 20 seconds of video are the best. Thanks.

A these guys wedge within rocks and darts into structures- appears to be fin rat damage which with good diet and time should heal on its own. Currently it does not seem to affect its swimming and if it goes the other direction, treatment in a separate tank will be seachem neoplex

 

[K9Fish]

A these guys wedge within rocks and darts into structures- appears to be fin rat damage which with good diet and time should heal on its own. Currently it does not seem to affect its swimming and if it goes the other direction, treatment in a separate tank will be seachem neoplex

Thank you.