What is strange to me is that the marks that were on his side have disappeared. The fin spots which i think is lympho seems to be common in angels that has just been in copper. Nyaquatic had him for 6 weeks in 18ppm copper so if it is lympho it would make sense. The white spots around his mouth are the only thing that concerns me, I would agree that it is bacterial but I just don’t know if it is worth the stress to him to catch him and try to treat him with antibiotics or to take the gamble and see if it heals on its own.