Quarantine Tank Screw Up

[squid row]

A slightly better pic.. please ignore the brown patch, that is algae. Also please ignore the mess. The tank top trim leaked and made a mess before I could reseal it and I have not fully cleaned it up yet

 

[HumbleFish]

It could be something viral, or maybe a "skin rash" from copper exposure. I have noticed many times after I treat a Hippo Tang in copper that they will develop these white "lesions" which are NOT parasitic when I scrape them.