There is a side patch of something which is saw on my female clown a few weeks ago. I did prazi but wasn't able to do more than 3 days. I did so as it sorta looked like a fluke but where a fluke would have come from is a mystery given that everything in the tank has either been qt or gone through prazi several times. However I am thinking it is some sort of injury given that the dorsal fins look frayed. This fish got down with a bacterial lesion a few weeks ago but I am hoping this is just an injury. I went ahead and added brightsell fish recover m and prazi to my tank just incase (my go to since I once had some parasite come from a bad batch of food which killed a handful of fish but was eliminated eliminated prazi).