Mine was a green serpent star. I think that they are like every other marine creature. Sometimes you can have a peacful specimen from a normally agressive species. And just the opposite is true as well. I have a Yellowtail Damsel that is the most timid fish in my tank. My Condy hasn't bothered anything either. I hate it when people on here immediately jump to "oh my, get rid of that. Take it back". I would say that if you have one and it's not causing a problem, great. Enjoy it. If it becomes a problem, move it.
One night in Bangkok and the worlds your oyster. The bars are temples but the pearls ain't free.