Small crabs?

1fastrock

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Hello everyone I just noticed these in my aquarium this morning and was wondering if anyone could tell what they are. Or even if they are helpful or hurtful.
 
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1fastrock

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Thanks for the quick answer! Are they harmful or hurtful and where do they come from??
 

Joshua2598

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Harmless hitchhiker. Can grow out of hand like in my tank and might grow on/irritate corals when they get out of hand. Check if the moved if they haven't then they are spriobib worms
 

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