After a closer look at the pic you provided I still think you have cnidarian stings but I think there's something else white on those clowns. Particularly on the bellies of those two fish. I'm inclined to say possible brook or amyloodinium but it's hard to say without a better closeup. Either way I would get them treated immediately.
I would not recommend doing a freshwater dip as it was suggested. Your fish should NEVER look as though they're dieing as a result of a treatment. What was described is typical of fish that have undergone thermal shock. To prevent this, the water should be the same temperature as the system they're currently residing in. If you use distilled water, you shouldn't. It may have extremely low dissolved oxygen content as may other bottled waters. Low oxygen may also help explain why the fish look like they're dieing.
Formalin further depletes oxygen levels.
Cold water and low oxygen does nothing additional to the pathogen and dramatically increases your chances of losing your fish during the process.
While FW dips are commonly used and accepted as a form of treatment for various maladies, I do not do FW dips myself. Instead, I generally go with a month in 1.009 SG. This is known as hypo-salinity or osmotic shock therapy. I use hypo frequently as a precautionary measure during quarrantine.
In your case I would get them in hypo immediately then sit down and get an accurate ID on their disease and the proper medications for treatment. Coppersafe and Formalin III are two meds I have come to appreciate as they treat most diseases that are quick clown killers. When treating with Formalin III or any other formalin product, make sure it is fresh. If it has been opened and allowed to sit around it can precipitate and become toxic.