My boyfriend bought an orchid dottyback a few weeks ago. We saved him from a sixline wrasse that kept nipping him at the store. Upon bringing him home he did have a small bite or two but a week after having him he developed a huge grey/white patch on his sides. I did notice some very thin stringy poop that came from him. Other than that he is eating and acting very healthy. Upon some internet surfing I found that it seems to be very common for orchid dottybacks to get illnesses. I saw that a lot of these posts were left undiagnosed as the pictures were not clear enough but I sat and took pictures of him for a good ten minutes. I have some clear ones and would like anyone to say they need more to help a diagnosis. I believe I may have narrowed it down to a parasitic infection and to treat with Prazi-Pro, but I also want everyone's opinion from here as well.