Reefkeeping South Africa » Marine Aquariums of South Africa » What is this?

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  What is this?

  Posted: April 17th, 2011, 10:03pm CDT by Landu

  Doing deep clean on sump ext and found tons of these things attached to sump glass and even in skimmer, looks like mini featherdusters but really have no clue.
  
  Anyone with any info please advise, good or bad and what to do...
  
  Thanks