What is this?

Oter292

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I think I know what this is, but would like further exam? Also, is it a pest or beneficial for my tank? It’s alive.
 
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Oter292

Oter292

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Tucson
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I think I know what this is, but would like further exam? Also, is it a pest or beneficial for my tank? It’s alive.
I think I know what this is, but would like further exam? Also, is it a pest or beneficial for my tank? It’s alive.

Brittle Star, harmless.

IMG_2484.jpeg
 

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