Help I'd these

#1
Can embody help out I'd what's on the picture. I have a rock full of this , it's fleshy in color and has this long strings. Any help will be appreciated.

 

CRW Reef

Blue Whale
M.A.S.C Club Member
ex-officio
#4
Looks like a sponge to me. I would say its fine, but if it starts to impede on coral growths and space you can just trim it back.
 
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