What is this? Hard Spiral Tube

[Hupajupe]

I just found this rather large hard spiral tube that is under one of my blastos. I am not sure what this is, thought it might be a Spirorbid Worm but this is not the white color that most of the pictures of Spirorbid Worms show. The opening is rather large but i can not see any creature inside. Any Ideas?

 

[Cthulukelele]

I just found this rather large hard spiral tube that is under one of my blastos. I am not sure what this is, thought it might be a Spirorbid Worm but this is not the white color that most of the pictures of Spirorbid Worms show. The opening is rather large but i can not see any creature inside. Any Ideas?

To me it looks like a large vermentid snail

 

[Hupajupe]

To me it looks like a large vermentid snail

are you sure? I have never seen vermentid snails get this large before. This is about the size of a penny, I could put the end of a cue tip in the opening.

 

[Cthulukelele]

are you sure? I have never seen vermentid snails get this large before. This is about the size of a penny, I could put the end of a cue tip in the opening.

Vermentid snails come in several different sizes. I am not sure no as I would want to see its feeding response for a 100% conclusion, but I've seen vermentid snails with a total shell diameter greater than a penny. Those are the vermentids I hate the most because when they feed they make very large mucous nets.

 

[ISpeakForTheSeas]

Yeah, that looks like a big vermetid species to me too - some species get really big:

Yeah, the biggest vermetid species has a max length of 45 cm (though 10cm is average), so some of them can be huge.

Edit: the species name is Ceraesignum maximum.

 

[slav621]

I think it’s Vermentid snails too. Or the start of one for sure.

 

[Hupajupe]

I have dealt with the really small ones and even had to do a full tank tear down 2 years ago because they took over everything, we are talking tens of thousands of them, when it got to point they were even killing all my coral I threw in the towel and started over.

Well I guess i will just fill the tube opening with glue and be done with it then.

 

[slav621]

I have dealt with the really small ones and even had to do a full tank tear down 2 years ago because they took over everything, we are talking tens of thousands of them, when it got to point they were even killing all my coral I threw in the towel and started over.

Well I guess i will just fill the tube opening with glue and be done with it then.

I hope mine doesn’t get that out of control..

 

[Reefkeepers Archive]

Yep, vermited, cover it with coral glue

 

[Hupajupe]

OK this all makes sense now. I had this blasto near some other coral and I would notice each day that it looked like there was a mucus strand between them and I though they were attacking the blasto. So I moved it and those other corals are much happier now... here i was thinking they just did not like the Blasto but I guess it was the snail and not the coral... LOL. Well its all sealed in with glue now. I hope this does not mean I have a bunch of other large vermenitid snails hiding elsewhere in my tank now.

 

[ISpeakForTheSeas]

I hope this does not mean I have a bunch of other large vermenitid snails hiding elsewhere in my tank now.

The big species don't seem to spread like the small ones, so this might be your only one.