In the video, there is a slight moment where the fish moves and shows the left side. The sun hits directly at him and you see the 3 marks that I was talking about.
Well, I can see the spot on the left side of the darker clownfish. That isn't ich. I doubt that it is flukes either. Clowns are often a bit "rough and tumble" could it just be a missing scale? Those can take some time to regrow....
Jay