I don't know about them dying if removed from host corals I sold a bunch of my corals when I moved and when I broke one colony to get it out the little guy scurried away went on to live for a long time in the tank. I think more of the problem is they are just so vulnerable.
I know we can't order from live aquaria bit this is where we got the idea from a few years ago. They defiantly were not cheap to order tho.
http://www.liveaquaria.com/product/p...14&pcatid=2914
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank