White things on live rock?

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TyZac

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Hi I’ve noticed these fat white worm like things on my live rock are they safe? What are they? (Circled in red on picture)

BA18506B-AC4F-4BF4-8CC5-7B37C20D6E67.jpeg
 
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michael giordano

michael giordano

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That sponges and they are very good, it shows your tank is maturing and they also filter feed the water
 
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