Tubes with Green Florescent Top Edge

[slingfox]

I bought some live rock from KP Aquatics. Can someone please help me identify what these tube like structures are? The tip of the tube is florescent green (three in middle of the picture)

. Are these vermitid snails or something else?

 

[blecki]

Could be. Could also be a tube worm. Easier to ID under white lights. Does anything come out of the tube?

 

[slingfox]

Here is the same area under white light. I have not seen anything come out of the tubes yet. When I removed some a few weeks ago they were hard but fibrous similar to the outside of a plant. Not sure if the texture would change if I let them grow larger.

 

[blecki]

Fibrous suggests tube worm. Is the tube rigid or flexible? Vermitid shells are more like glass. Kind of have the consistency of peanut brittle but much sharper, and their shells are rigid. But if it was a worm the fan should be coming out, so it might also be dead. If a big net of mucus comes out when you feed the tank it's a vermitid.

So in the picture, on the left, I'd associate the grey with pale 'lips' with a tube worm. But on the right, the brown tube, looks more vermitidy.

 

[ISpeakForTheSeas]

My first thought would be hydroids (or potentially polyp stage jellyfish), as some colonial hydroid species fluoresce similar to this.

 

[slingfox]

Fibrous suggests tube worm. Is the tube rigid or flexible? Vermitid shells are more like glass. Kind of have the consistency of peanut brittle but much sharper, and their shells are rigid. But if it was a worm the fan should be coming out, so it might also be dead. If a big net of mucus comes out when you feed the tank it's a vermitid.

So in the picture, on the left, I'd associate the grey with pale 'lips' with a tube worm. But on the right, the brown tube, looks more vermitidy.

The tube was flexible when I removed some with a small metal scraper and some by filling it with my fingers. I have not seen the tubes expel any sort of mucus during feeding (I was watching for that specifically today when I fed the tank mysis + Benepets). Maybe I will let them grow for a bit and see what happens. I removed all I could find a few weeks ago but they seem to be back on this rock now.

 

[slingfox]

My first thought would be hydroids (or potentially polyp stage jellyfish), as some colonial hydroid species fluoresce similar to this.

Thanks, I will looks those up!

 

[blecki]

My first thought would be hydroids (or potentially polyp stage jellyfish), as some colonial hydroid species fluoresce similar to this.

Hydroids with a tube?

 

[ISpeakForTheSeas]

Hydroids with a tube?

Or jellyfish polyps, yeah - the clearest examples I know at the moment:

Are we sure these are colonial hydroids?

I found some of these in my tank- and I'm really not convinced that they're colonial hydroids. Every single ID thread I've come across has them labeled as colonial hydroids, but based on a few observations I've made, I'm not convinced. Here are some pics of the exact type I'm talking about...

www.reef2reef.com

Hydroid advice. - Reef Central Online Community

Hydroid advice. Reef Discussion

www.reefcentral.com

Edit: Just to add, these may not be tubes at all in a traditional sense - it may just be the hydroid's flesh.

 

[vetteguy53081]

May be tube worms but pics are very hard to work with. Can you post a you tube video?