Unknown anemone or ???

[jeffchapok]

Does anyone know what this is? I've been watching it for about 8 months, and even now it's still tiny -- maybe 1/8" across.

I'm familiar with aiptasia and I don't think it's that. Majano maybe? But if majano grows this slowly, I don't know how it could ever be much of a threat.

 

[Katrina71]

Google fire anemone. See if that might match yours. I have been told they really hurt if you're stung by them.

 

[Crabs McJones]

Looks like the mouth of a cucumber

 

[DSC reef]

Definitely not a pest anemone. I'd say a cucumber or a medusa worm

 

[jeffchapok]

I'm anxious to see what it turns out to be. It'd be cool to have a cucumber or Medusa worm, but it doesn't have any body that I can see. The tentacles are directly attached to the rock. And it has never moved. It does kind of look like a fire nem. I guess we'll wait and see.

 

[Lovemyreef2015]

I'm anxious to see what it turns out to be. It'd be cool to have a cucumber or Medusa worm, but it doesn't have any body that I can see. The tentacles are directly attached to the rock. And it has never moved. It does kind of look like a fire nem. I guess we'll wait and see.

Sea cukes like to hide in rocks or sand and only leave their feeding tentacles out. I agree it looks like sea cucumber or medusa worm.

 

[Katrina71]

This is why y'all are the go-to folks! Thank you for the education!

 

[ScottR]

Since the feeding tentacles look more uniform, I’d guess Medusa over cucumber. Not a bad thing either way. I have some in my tank. They seem sessile because they have never relocated. I also can’t see the actual body. They hide in the rock.

 

[jeffchapok]

Since the feeding tentacles look more uniform, I’d guess Medusa over cucumber. Not a bad thing either way. I have some in my tank. They seem sessile because they have never relocated. I also can’t see the actual body. They hide in the rock.

I agree except for one thing...

I did some reading up on them and the article described them as "fast growing". This thing is anything but. Since I first noticed it last spring, it's barely grown at all. If it has a body buried in the rock, maybe that's grown, but the tentacles have not. You have to look hard to even see it sometimes. I originally found it only because it flouresces a little bit under actinic light. Otherwise I probably would have never noticed it.

 

[ScottR]

I agree except for one thing...

I did some reading up on them and the article described them as "fast growing". This thing is anything but. Since I first noticed it last spring, it's barely grown at all. If it has a body buried in the rock, maybe that's grown, but the tentacles have not. You have to look hard to even see it sometimes. I originally found it only because it flouresces a little bit under actinic light. Otherwise I probably would have never noticed it.

I have some very similar ones in my rockwork. Been watching them since the beginning of this year. Some fluoresce a green color. Some are white. They are sessile. And still no idea. I’ve just passed them off as a tube worm or something of the sort.