Reefkeeping South Africa » Marine Aquariums of South Africa » What is this on my Mushrooms?

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  What is this on my Mushrooms?

  Posted: January 14th, 2012, 5:44pm CST by Helga

  Can someone please identify this on my mushrooms. It is spreading to all my mushrooms now. It is brown in colour and if I view it through my macro lens it appears to have a white "mouth" in the middle. It does not have a hard shell.
  
  What is this and what should I do?