Originally Posted by Tank2379
...how would you know if that specific Coral piece is loaded with ICH and you have no clue that it's there. ...
That's just not the way ich is. A piece of coral will not be "loaded" with ich. It doesn't live on coral. And while it does swim around in water, a few drops of water won't be loaded with the parasite. It lives on fish, and the dormant stages live in your sand. Your main concern with ich is when it comes in with fish (not the water, but actually present on the fish).
But as Innovator mentioned, if you're concerned, it won't hurt to QT corals. Just make sure you have adequate lighting on your QT to do so.