The starfish was sold to me as a red spiny. When I got him I was pretty much FOWLR. But I do remember another customer warning me about his troubles with them in his tank, but I was so new then, I really didn't understand him. I've had the starfish since my original tank (almost 2 years now!) the emeralds came along when I had a bubble algae outbreak about 9 months ago, and seemed ok after that so I left them in as well. There is still another emerald somewhere in the tank...
So far confirmed kills are my alpha omegas and my incredible hulks. Fire and ice, eagle eyes opened up first thing this morning on the frag rack, still have several polyps of each. I hope it was the starfish and emerald, but I'll be ever vigilant today, as I've always rode the line with "reef safe" animals (Koran and coral beauty angel, Niger trigger, lunar wrasse) and see if there's a problem there as well...