I voted for quarantine and dipping. All of my fish go into a 10gal quarantine tank, which allows me to observe anything out of the ordinary. If I notice ich, etc. they'll then get transferred into my hospital tank that is kept at a salinity between 12-14 for a minimum of 6weeks. I have not ever had ich in my display tank!
All corals get a lugols dip and a freshwater dip (as per Eric Boremans recommendations). They then go into the quarantine tank for a minimum of 6weeks for observation. I have never had any red bugs, aptasia, nudibranchs, etc.... in my display tank.
In my experience the hardest part is the waiting game, but it sure is worth it.
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