I canīt edit my post. Please, find below some new pics.
The anemone seems to recover slowly, he does OK with the lights. Maybe all the bacteria are dead and the infection is halted. The mouth looks closer. No deflation anymore.
I will let him in the bucket with new seawater and antibiotic for one more day. With luck, when returned to the main tank he will be ok. Then Iīll try to take a closer photo of the "false clones?".
Itīs amazing that the amonia does not seems to be a problem for him...