Brew12
Electrical Gru
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My Tank Thread
Ok, that leaves two options in my mind. It is either Brook or a chemical irritant.By the pictures I can tell that is Brook then. They look exactly like that.
If it is Brook, you will need to set up a QT system and treat per the instructions in the link I posted above. I've never had to deal with Brook (thank goodness) but it's a tough one. If you can do a fresh water dip you can buy yourself time but I understand that catching them in a reef before they are very sick is challenging.
Brooks visible symptoms are due in part to excess mucus production that could also be caused by a chemical irritant. The itchy arms still make me think this is a possibility. If this were my system I would do a 50% water change and change out the carbon for some fresh stuff. I would even add some extra in a filter sock.
My reasoning is that even though Brook may be more likely, it is also going to be the bigger challenge to deal with and could take days to set up a solution. Since, in my mind, a chemical irritant is a possible cause and I could take immediate action to help correct it I would do that first.
Again, I'm so sorry you are going through this. It's a horrible situation to be in.