Help ID this critter

eagerreefer

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Trying to figure out what this is. They are in my sump as well as all over some of my rocks. They kind of look flatworm shaped but stand straight out on the rock. Thanks!

0D9BA0F3-C4E9-41D2-8D6B-3F3D8869C7E1.jpeg 57E1095B-81F3-4053-9DD8-C3D3C67B3306.jpeg
 

vetteguy53081

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Looks like filter feeding pineapple sponges
 

SHNICI

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If they look/are a bit fluffy then it's filter feeding pineapple sponges like the others says (Harmless for your tank)
 

A worm with high fashion and practical utility: Have you ever kept feather dusters in your reef aquarium?

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