Those are harlequin shrimp and yes that is a blue starfish. Harlequin shrimp are specialists: their diet consists mainly of the tube feet of starfish, although they will also eat sea urchins. http://www.aquahobby.com/marine/e_helegans.php I believe it is in that link that it is claimed that a fair sized starfish will feed a harlequin shrimp for two weeks.
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(no subject)
Date: 2008-11-28 07:23 pm (UTC)What's the thing they're sitting on? They look like some sort of shrimp, but I can't identify that at all. Some sort of coral? A starfish?
(no subject)
Date: 2008-11-28 07:27 pm (UTC)So I don't know!
They eat them alive
Date: 2008-11-28 07:41 pm (UTC)Re: They eat them alive
Date: 2008-11-28 08:51 pm (UTC)