Help ID this for me

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Can anyone tell me what this is? I didn't buy it, started noticing it was growing out of something that had died in my tank
Thanks
 
You might Google it. Most people think of aiptasia as a pest because sometimes it spreads quickly and takes over the tank, some would call it aggressive. Other people like the one they've had in their tank that has never spread. Don't want to burst your bubble, but keep an eye on it.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • 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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