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!

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

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • Not yet, but I have one that I want to buy in mind!

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  • No.

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  • Other (please explain).

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