What is this ?

Aceman21

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I bought a used skimmer an this is in the filter an I'm not sure what it is.
ImageUploadedByTapatalk1429296017.630521.jpg
 
It's a type of tubeworm but not feather dusters. Feather dusters don't grow in hard calcium based tubes. A just scrape them and they should come off
 
How do I prevent them from coming into my filter when I start my tank ? Are they harmful
 

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

  • Yes!

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  • 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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