Unknown growth on LR

[dcd59f]

I'm not sure what this growth is on my live rock. There are one or two others in the tank. I started out with dry rock and have a mixed reef tank with SPS, LPS and Zoa. Everything has been dipped, but you know how that goes...

The growth opens and shuts, but is mainly open during the time the lights are on. Any help identifying this and letting me know good vs. bad would be much appreciated.

All levels are acceptable.

Alk - 9
Calcium - 451
Magnesium - 1360
Gravity - 1.024
PH - 8.2
Phosphate - .02
Nitrate - 4-5

Thanks for the help!

 

[j.falk]

Looks like a bristle worm.

 

[dcd59f]

You're looking at the tentacle of a brittle star fish. I'm referencing the object behind it, attached to the rock.

But now that you've said bristle worm, surprising how close the tentacle and worm look similar.

 

[Sugar Magnolia]

Can you get a few more pictures? I'm not sure what I'm supposed to be looking at.

 

[dcd59f]

You're looking at the tentacle of a brittle star fish. I'm referencing the object behind it, attached to the rock.

But now that you've said bristle worm, surprising how close the tentacle and worm look similar.

 

[dcd59f]

Attached are more pics for the object in question. Trying to give perspective on size. Probably a little bit bigger than a pencil eraser.

 

[Sugar Magnolia]

Too much blue light.

 

[dcd59f]

Thank you for pointing that out, I was wondering if that would cause an issue with identification. Still learning this whole LED lighting vs camera relationship. I turned the blues way down and the whites up on the this photo.

 

[mcgyvr]

Looks like a bivalve (scallop,etc..) of some sort.. Harmless

 

[dcd59f]

Thank you!