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Can't say for sure from the photos, but butterflies are notorious for getting bacterial infections: TANK TERROR: Bacterial Infections In The Reef Tank
I preemptively use NFG on them: National Fish Pharm : Nitrofuracin Green
Sorry for your loss. :(
Most coral diseases are bacterial, but ciliates (e.g. Halofolliculina corallasia), viruses and fungi are possibilities as well.
More info on that: http://www.korallionlab.com/wp-content/uploads/2012/05/Sweet_and_Sere_2015.pdf
I don't see any in the video but ... Can you see any ciliary...
^^ This is what I do as well; although I isolate all corals/inverts to a fishless environment for 76 days.
The thing about a coral/invert QT is it can be pretty simple. One or two pieces of LR for filtration, heater, some flow, decent light, etc. You don't even really need a skimmer being there...
They are susceptible to uronema, bacterial infections and intestinal worms. The latter can kill them pretty quickly sometimes, but you should notice the fish getting skinny and white stringy poo.
Looks like HLLE to me as well: HLLE (Head & Lateral Line Erosion)
You can reverse it (somewhat) be feeding nori and vitamin enriched foods, but he will most likely never look 100% "normal".
If you haven't done so already, I would check for stray voltage in the water just to rule that out as a...
You're not in trouble yet, but in another week you will be. Have you tried LRS? Garlic? I've also had luck w/Regals using the two frozen foods below (probably because they contain sponge meat):
Angel Formula, Aquarium Foods, Ocean Nutrition, San Diego
Frozen Angel & Butterfly Formula – San...
Thanks everyone! Sorry for the delayed response. Things have been crazy lately, as we are gearing up for the official launch of the business. But I will make a point to check here regularly to answer your questions.