I just noticed this on my rock the other day and it has gotten MUCH larger in just a day or two. Ill add pictures in my next post really fast! Thanks in Advance!
Well now, that's interesting. It would certainly look like a vermetid snail's webbing, but that's not a vermetid snail's tube. I've never known them to construct sand tubes, like the Chaetopterid/Spionid worm. I'll have a look around and see what I can find.
I guess it could be a bad thing where we're not 100% sure on the ID, but not too many worms/snails in tubes like that would do harm. If it were me and that were in my tank, if it didn't show itself after time, I would be removing half that tube just to see if I could get a peek at what's inside. Does the webbing come and go?
LOL! It pretty much describes only one thing. What confuses me about Mandrews, is the tube is made up of the substrate. Vermetid typically have a hard smooth tube made up of a different material.
Yeah I looked at the pic. Better from what I am reading they are spinoid worms because the sand pieces . Mine do have a tube like a feather duster so to speak .