So I had what I thought was ich present on some of my tangs after adding a batch. Looked like tons of really small white spots that covered the entire body, was easy to see on my Achilles. Since I had had the Achilles for so long and was happy and healthy and others were showing signs I chose to ride it out (right, wrong or indifferent it doesn't matter now that's not what this post is about). He went on and was fine for another 3-5 days and then out of the blue I come home and he looks like the picture below. I removed him and placed in a separate tank and he perished the next day. Not sure if the picture would reveal something else that might explain the quick turn and loss. I have since lost almost all of my fish and it really doesn't add up that it would just be ich. Tested and ammonia has stayed within range and my nitrates read 1ppm on Sunday. Any thoughts?

