Regardless whether you believe ich is always there or not, it will more than likely show up in your display tank despite your best efforts. This certainly doesn't mean quarantine procedures are useless but ultimately when you're dealing with something as common as marine ich, which can be introduced without fish, at some point you have a significantly good chance of dealing with it.
My advice is to accept the fact and not attempt to fix it. Leave the fish as is, in a healthy system with healthy unstressed fish ich will not flourish to the point of casualty, rather it will come and go in a fairly harmless manor. A UV sterilizer properly designed and sized for the aquarium is a good investment. While it will not eliminate ich completely and using it all the time is not necessarily beneficial for reef environments using it periodically as needed will help prevent large outbreaks of ich, especially when stresses are potentially high which is typical when new fish are introduced.
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