im guessing is some kind of fungal infection. my fish were all doing fine and out of now where one of my anthis got it, and so does a second one. i know its not ick. I just keep garlic soaking my food every day in hopes that they will bounce back, but no luck, they aren't in any pain or discomfort my anthis is still strong and dominant in the tank? i have had it for about 2 weeks now and its still looks the same, it seems like my tang may be slowly getting it as well? Im going to my LFS today and hopefully they have some thing, or advice to help me out. i will keep you posted.