What is this yellow stuff?

hyde7278

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when I came home tonight I've noticed something yellow on some of the live rock and some on the sand bed can anyone help ID it and let me know what to do about it.
 

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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