Just notice this bad boy on my LR couple days ago.

[cwalk31]

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[Sniperhank]

Looks like it could be a bleached out anemone, like a rock flower. Does it have a mouth? This is all assuming I'm seeing it right that they look like tentacles. Can you get a closer shot?

 

[cwalk31]

Here is the close up it was just closed until I turned on the lights


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[Sniperhank]

An anemone indeed. Just a bleached out guy. They need intense lighting to survive and pristine water conditions will help it recover...if this is something you are going to try to do. Could also try to turn it into your LFS for store credit or to a friend that has anemones.