New critters

DCF

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I am new to this so please help. I have found two new critters in my 20 gal tank. I think one is a micro brittle star and the other mini feather duster. Good or bad? Keep or get rid of them? Pic and video below.

IMG_4949.png
 

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Crabs McJones

Regional Reef Manager (AKA Revhtree's Boss)
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I agree with brittle star,
second one is a barnacle
 

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