You may have more going on in the tank than just ich if you didn't see any ich on the powder blue and it passed that quickly!Also sounds like you are prety much at your stocking limit for that size tank.
On an up note I recently dealt with a bout of ich on my small Blue Tang.I could not get it out of the 135g and decided to keep feeding with vitamins and do a few large water changes and sand cleanings over the course of a week and a half. Rationalle was to keep the fish as strong as possible while at the same time reducing the numbers of parasites in the substrate and water. Seems to have worked so, far all fish doing well and no sign of ich in 4 weeks now. I may not be out of the woods yet!
As far as the Regal, I can't say for sure how well it will endure I really think it depends on how healthy the individual is and how bad the infestation is.IMHO I also believe that if you have alot of difficulty in catching a fish, you can actually do more harm by additional stress and harrasment in trying to remove it.
Hope all pull through!
BTW If it is a reef tank don't be cajolled into using so called "reef safe" meds
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