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It's an asterina star.
It's asymmetrical because it's lost limbs to reproduce or something picked them off.
Some of them (the grey ones, I believe) are known to eat corals but I've never seen the ones in my tank eating any.
I'm not sure long term how they do with clams but if it makes you feel any better I had one crawling around on my derasa for a couple of days last week with no visible ill effects.
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