Sorry, Yes Head and Lateral Line desease. I'll get pics tonight for you guys.
LukeFox, I found an article on reefkeeping.com talking about many possible problems but little for answers.
The water params are fine. I don't have the exact numbers here but I did check before I did my schedule water change on Saturday (5% every 2 weeks).
For food, I mix it up between Nori, Ocean Nutrition Prime reef flake, ON Form#2 flake, Form#1, Form#2, and spirulina Frozen food.
I did recently add some activated carbon into the sump. Can that possible cause it?
I've had the fish for 2 years but this is the first I've seem him with this.
Of course he is acting normal...