If QT consists of a 20 gallon with PVC pipe and a sponge filter, than you'd be better off not...
But, if you're able to provide a QT with excellent water quality, lots of live rock, dim light, and no competition for food or territory you'll have a much better chance... Many times it takes a while for them to take prepared foods, but chances are much better if the food is not disappearing from established fish within seconds... also, as I've recommended before, a clam on the half shell is virtually irresistable to these guys and will tide them over until they do realize that stuff floating in the water column could be food... which really isn't the case in the wild...
Incidentally, I never use medication, fresh water dips, hypo, copper, or anything else unless absolutely necessary... just concentrate on giving the fish the least stress... I've seen some people acclimate fish unnecessarily for hours, dumping water and swishing the plastic bag... Unless temperature, pH, and/or salinity are much different it's not necessary for too long...
Just my opinion... and man is it great to see this thread develop over the years with so many beautiful regals...

We all differ in opinions here and there, but we all share a love for this beautiful fish!