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That's right Ich which is one of the deaseases that many fear will contaminate their tank once a new introduction happens is an invert, so it won't stick to inverts.
I always find this one kinda hard to be 100% as far as recommendations are concerned. The risk is very very low but still a possibility. Personally I don't QT any inverts but I am very cautious never to buy any inverts from tanks that contain fish or are connected to fish sytems. If you're not going to QT, that's the next best thing. Only problem is unless you are buying in person, there's no way to know. :?
Some corals can survive fresh water dips quite well most won't though. Mobile inverts being osmoconformers will not for the most part. It wouldn't really do any good anyway. While the parasite is encysted, it is very well protected and pretty much untouchable.