Well I hate to say it but I would be leaning more towards Velvet then anything else as its a fast killer, it wiped out my very first 65 gal in a matter of days after it had been up for almost 6 months, I only had one survivor a yellow tang. I really don't know where it came from or how to treat for it, if you even can because it kills so fast.
I don't have a QT set-up full time but can put one together in a matter of minutes. I usually only buy fish from a few LFS & from well established tanks.
A UV will do nothing for Velvet, has one on my 65 to no avale. All my fish would eat until the last day or 2, all of them had a very slimy coat & where very pale. My Volitan Lion was the hardest one to watch go because of the way Velvet eat away at it huge fins, desolved them right to the cartilage. It was so very hard to watch.
Good luck mate, hope I am very wrong for the rest of your fishes sake.
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