Sounds like Asterina starfish. Would you mind posting a picture? If it is an Asterina Starfish, proceed with caution. A few species are known to eat coral tissue, but this isn't very often at all. Just keep an eye out.
Some say they're ok and a good compliment. I was finding them on a monti and next to my zo's and they weren't being nice to the monti. I just pick them out as I see them now. Here is a link to the bad ones but there are many that don't bother a thing.
I will look again tonight, but have never seen legs longer than the others, they are all symetrical and white as sand. I will try and post a pic but may be hard to get a good pic of them
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