An ID please, sponge or algue

Leelalie

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I noticed this growing for some time. Could any one tell me what the yellow growth is plse?

I

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Creating a strong bulwark: Did you consider floor support for your reef tank?

  • I put a major focus on floor support.

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    Votes: 27 20.5%
  • I put no focus on floor support.

    Votes: 48 36.4%
  • Other.

    Votes: 4 3.0%
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