What is this?

cjp847

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Can anyone tell me what this is? I know I've neglected my tank a little bit. Are they bad.

20201127_135228.jpg 20201127_135359.jpg
 
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cjp847

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I'm about to move to a new 125 gallon. I'm wondering if I should just start with new rock?
 

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vetteguy53081

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Looks more like tunicates than just sponge
 

Form or function: Do you consider your rock work to be art or the platform for your coral?

  • Primarily art focused.

    Votes: 13 7.8%
  • Primarily a platform for coral.

    Votes: 30 18.0%
  • A bit of each - both art and a platform.

    Votes: 112 67.1%
  • Neither.

    Votes: 7 4.2%
  • Other.

    Votes: 5 3.0%
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