Can someone help me with an ID?

NewEnglishMutt

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What is the blackish things growing on the rocks with my corals? The corals don't seem to care that it's there I just don't know what it is
 
Ok sweet it's been there as long as I've had the tank I had a feeling it was a sponge or some kind of filter feeder but wasn't sure.
 

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

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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