What are you going to do when your cleaner wrasses get ich than? Old school is old for a reason, with the knowledge and technology of today with internet, you can get on the shoulders of the people who have gone through it and tried it for themselves. Only way to completely eradicate this parasite is in a QT/HT no less than 6 weeks leaving your DT fallow, and a treatment of hyposalinity or Copper. No reef safe cures, no natural cures, If your dog or cat was sick, you'd treat it with chemicals or drugs that a vet prescribes. Why not do it for your other pets as well. Most of us aren't vets, a few of the people on here are marine biologists. Listen to them, read the stickies, follow the prescribed treatments. And your fish will survive.
I realize that it's a royal pain to do QT. I tried everything to avoid it like everyone else. Bottom line it's a forgotten essential to this hobby. Go on any common forum and post a thread and ask who quarantines. And you'll get 90% saying all they do is feed heavy and water changes. I'm sorry for the rant, I know I'm blathering.