I talked to my LFS where I got them, he’s pretty confident it’s ich, he’s giving me a 10 gal tank to use for a hospital tank for now, has some treatment options available, as for the rest of the fish he said they may have some natural immunity and may just be hardier so to just keep an eye on them and not to treat the DT cause it will ruin any future corals, he said sometimes that ich will manifest itself on a fish when it’s stressed and at its weakestSorry, did you see the still pictures from last night? The clown clearly has an external protozoan infection .
Jay