White "stuff" on clownfish mouth.

[Railskinner]

Ive just added another clown to my tank a week ago and they seemed to have being fighting quite alot ,looks as though they have settled down . Today i noticed as well that they have white lips. I now think this is bruising from all the bitings that they were doing to each other. I'm going to have to watch this as well carefully. Also are eating very well.If u discovered what this is plz let us Know