Originally Posted by nicetry
Fungal infections are pretty rare in saltwater systems. I agree with Beth that it does look like lymph. It should clear up in short order with a good diet, good water and low stress environment.
I have to believe there was something else serious going on with this fish & your tank after you transferred to the main tank if it was fine for two weeks after QT. Was it eating anything else you were feeding? Brine is just not a good food IMO. Were other fish harassing it? If I remember correctly, they prefer chopped/shredded clam.