I would treat all the fish in hyposalinity in a large enough tank with good porous cured liverock and leave the main tank empty of fish for 70 days at least.
Once the ick is that it will remain there and your fish will be in and out of it. Eventualy they either win or lose the battle. Looks like the naso is going to lose that battle if he does not eat...not a good sign.
There is nothing more pleasant than having a parasite free tank. There is nothing more anoying than having a parasite infested tank.
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More fish die from human stupidity than any other disease...
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