What are these thingys?

Shuladog

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I discovered several of these growing on the walls and floor of my sump today. I looked around in the Critter ID forum but couldn't find anything that looked exactly like it. What are they?

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Aquarium Specialty - dry goods & marine livestock
https://www.youtube.com/c/ReefStache

What percentage of blue versus white lighting do you think makes the best coral growth combo?

  • All Blue

    Votes: 12 2.4%
  • Mostly Blue

    Votes: 311 62.4%
  • Even Balance

    Votes: 127 25.5%
  • Mostly White

    Votes: 39 7.8%
  • All White

    Votes: 1 0.2%
  • Other (please explain)

    Votes: 8 1.6%
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