What are these prickly anemone looking things?

Gabbydee233

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I noticed these growing in the tank recently. There are only two of them growing in the crevice of one of our live rocks. It's dark reddish, purple - looks spiney/creepy.

20160719_092045.jpg

Is it what I hope it's not?
:confused:
 

Figuring out the why: Has your primary reason(s) for keeping a saltwater aquarium changed over time?

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