The size of a loonie? Hmmm, likely too big to be an Asterina sp. Most starfish are predatory, often only stripping your sand of all life (which isn't good, and the number one reason I'm not a fan of "sand sifting" stars), but personally I wouldn't risk it. The only starfish allowed in my tank are Asterinas, Mini Brittle stars, and Black Brittle stars. The first two which are hitchhikers.
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~ Mindy
SPS fanatic.
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