Can anyone ID these?

TheClemsonKid20

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Just trying to ID these guys. Was doing a top off into the heater column of my tank and noticed them today. They are attached to the wall and don’t move. Any idea what I’m dealing with? Thanks.
 

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

  • I put a major focus on floor support.

    Votes: 59 39.6%
  • I put minimal focus on floor support.

    Votes: 34 22.8%
  • I put no focus on floor support.

    Votes: 50 33.6%
  • Other.

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