Why do people say they are so bad then? I just found four in my tank in less than 24 hours
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Actually, no matter how many legs or what color your asterina star comes in, they are generally reef safe, but can become carnivorous. I keep them because I only saw them behave negatively once, and they are pretty easy to pick off of things if so. Not a serious problem in my experience. Mostly, not a problem at all. I vote to keep it.