What type of disease is this?

I can't open the file, therefore can't view the picture. Remove to a quarantine tank. Treat for possible bacterial infection.
 
No, there are no anemones in the tank. A little background, I made huge mistake by not quarantining some new fish I purchased from the local FS. After about a week two of three orange anthias developed a cloudy eye and stopped eating. Then the Chevron started hiding in the rocks and almost stopped eating. He also went from a dark brown/burgundy to a light greenish brown. I have had him for three years. I captured all the fish placed them in a quarantine tank and first started out with PraziPro and then switched to KanaPlex. The reason I switched was my flame angel has a popped out eye. The flame hasn’t eaten in over a week. My two blue tangs and my convict tang are back in the main tank and doing fine. The only other issue I had was my Nitrates were high 25-50 ppm.
 
Nitrates don't bother fish at those levels. Did the Anthias die? Popeye is usually the result of an injury that leads to a bacterial infection. Antibiotics will usually clear it up.
 
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