We introduced 5 small Chromis. After a week, one of them got pop eye. Its been 4 days now and getting worse. The eye looks as if it has fallen out. Its a big white mass/hole. The fish lies on the bottom without feeding. Should we: isolate it in a breeding net in the tank with food, try a freshwater dip, leave it alone? We have slightly high NO3 at 5-10, but have 'protected' livestock with Prime. All other parameters are good and stable.