Is this a worm or eel?

[rx2life]

Could someone tell me what this is? I noticed it in my live rock two days ago. It’s black in color, has a mouth like an eel and a raised like fin on the top of it’s head. Light sensitive and almost becomes flat when spotted. It’s in a smaller piece of rock I added a few days ago.

 

watch in HD Video1

 

Watch in HD video2

 

 

Thanks!

[fretfreak13]

Even with the video I have a really hard time telling. From your description it sounds exactly like a peanut worm, though. harmless and beneficial

[Deleted User 3]

It's not a peanut worm... It looks like it could be an eel.. its really hard to see but in the 2nd video when it moved like that... try spying at night when lights are out for a few hours and see if it's out more for better pics.

[chrssprngs]

From the video it looks like something moved. ID? Moving object is best ican do.

[Tbone675]

take a pic with a flashlight or something on it with less blue light.

[Catbus]

kind of reminds me of a feather duster without a shell

[Rollermonkey]

Wouldn't an eel have tried to take a snack out of the shrimp when it went by? Even as small as it is, an eel would have acted predatorial...

[fretfreak13]

I didn't even notice the second video, sorry. Touch it, is it hard? It looks like a bivalve. Basically, its a little clam. I have tons of them, and some of them have little "teeth" looking things around where the shell comes together.

 

heres a pic of one I found on google. http://www.marineaquariumsa.com/imagehosti...06ea356ebde.jpg I'll take a picture of one of mine tomorrow, my lights are off.

 

And not necessarily with eels being totally omgimgonnaeatyourhead. I work at aquarium and in our main exhibit we have ten eels all with hundreds of small fish. They hang out by them all the time, and a lot of people even keep fish with their eels in their home tank.

 

Regardless, I would bet a thousand dollars that what the OP has is not an eel.

[rx2life]

 

Here is a pic with the lights.

[Limitedjive]

its a sea cucumber

[fretfreak13]

Does it ever move from that exact spot? Did you touch it to see what it feels like?

[patback]

Some type of cucumber or nudibranch

[19jeffro83]

Wouldn't an eel have tried to take a snack out of the shrimp when it went by? Even as small as it is, an eel would have acted predatorial...

I had cleaner shrimp kill any eat an eel.

[nibor]

It's a little bivalve of some sort. You can see it snap closed half way through the second video and clearly see both parts of the shell in the photo you posted. The little thing on top of it is probably a bit of algae growing on the shell.

[metrokat]

That appears to be a Eunicid worm. NUKE THE BASTARD.

 

 

 

 

There seems to be a bi-valve in the same hole the worm is in.

[patback]

Op, I think the problem is that you have really crappy videos with a somewhat okay picture and 20 different people are trying to I'd 20 different things.

 

Take a new close up picture and try circling it to help us help you.

[rx2life]

Thank you all for your comments and help. I did a 20% water change today and took it out. It was hard with a clam like shell.