Sponges?

bounchak

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Hi! What are these growing on my live rock? The big tan/grey thing just grew a tube like thing in last few days.

42C137BA-7849-4A84-B80E-2269FDDD78A7.jpeg
 

ying yang

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I would say looks like a feather duster/ tube worm tube but....
Do you see a mucus net coming g out of it catching food and dragging back in ( vermitted snail)
Or see a feather like thing coming out tube and reacts to light / shade or if go close to it ( feather duster ) and sponge is the white / grey thing of some kind I would say
 
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