Serpent Star "mangled" over night?

Spar

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found pieces of my serpent starfish all over my tank this morning, and most of him including his body is in the front corner of my tank with a cucumber eating him.

he lost a leg about 2 weeks ago but didn't think anything of it.

mainly tangs in my tank. only shrimps are a cleaner and a coral-banded that may not even be in there anymore.

i have noticed that the starfish has been eating some of my cyano bacteria. could that have been it? and then fish/critters tore him apart overnight?
 
I doubt anything tore it apart. Starfish do dissolve though.
 
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