If its pimple-lookin its probably not ich. Ich definitely looks like salt or sand is stuck to the fish.
It could be wounds from the tang, maybe but his cloudy eye probably isnt.
It almost sounds like flukes (sorry cant really tell from the photos) or could be a bacterial infection.
I would say give him a freshwater methylene blue dip. Get a bowl to the parameters of the water hes coming from (but freshwater) and squirt a bunch of the blue into it, make it look like toiletbowl water. Let Mr. Fishy chill in there for maybe 5 minutes.
Give him that treatment if he doesnt improve in the next day or so. If it is just boo-boos from the tang, they should clear on their own and then you'll know