Anyone know what this might be? (Again)

[One Eyed Bunny]

It's circular in shape, has 8 evenly spaced legs/ tentacles, and every few seconds it systematically brings one tentacle into its mouth, completely.

Very scary looking. We've had several of them appear in the tank over the course of, maybe, 4 or 5 hours.

 

[Ralistin]

I believe some sort of sea apple. They use those arms to catch food. You will see them fed the mouth with them. They especially like to open during rock blowing off time in my tank.

Enjoy them, they are not harmful in any way that I am aware of.

 

[One Eyed Bunny]

Does anything eat / kill them?

 

[Travis L. Stevens]

Looks like a basket star to me.

 

[capefear]

i cant see it

 

[Cutiewitbooty]

hmmm weird looking, i have no idea, but hey did you ever get a pic of your new clown?

 

[grunt187]

Sea Cucumber it looks like, we have several in our tank.

 

[Monkeyfish]

Definitely NOT a sea apple or a basket star. Most likely some type of "cucumber." Check out wetwebmedia.com and fishbase.org for a better id.

 

[Amphiprion]

It is some sort of cucumber. You can tell by the specialized dendritical feeding "tentacles." They are quite different from the rays of a basket star.

 

[Dischirm]

I would think it is one of these :
http://sealifeflorida.com/catalog/product_info.php?products_id=110&os
Csid=ac0700af4cd36ca25ecddc23bc9df6d2

hope the link works, its a sand sifting-burrowing atlantic cucumber