JMV

@bluestarfish Thanks, I’ll keep that in mind! I should probably get rid of him, but I’m pretty partial to feathered tube worms, so I’m hesitant to go the predator route. The body alone on this guy is also bigger than any bumblebee snail I’ve seen! It does put out mucous nets. It doesn’t seem to bother anything at the moment from where it’s positioned, but I’m sure if I had a bunch of these show up it would be problematic. I can’t really break it off without risking the spirobranchus tubes; the safest thing I can think would be to try to seal up its tube with a large wad of putty and super glue, but it doesn’t retract very far into the tube and I’m not sure it wouldn’t be able to push it back out before it set. He’s unfortunately also sort of adorable… we’ll see!

@lowsingle Not totally ruling it out. ??

Thylacodes looks right, thanks! I should caveat that the I’m basing the caribbean origin of the spirobranchus it was with from what the vendor indicated; I can’t really find any features to confirm for sure.

I recently added a couple clusters of Caribbean spirobranchus sp. worms, and in with them is this guy- apologies for the poor pic. Anyone familiar with these? Cause for concern in a mixed reef with small fish/inverts? I assume it’s some sort of massive vermetid, but I haven’t seen anything like it and my googling just turns up pics of more common vermetids. It’s in an opaque purple & white spiraling tube that is largest at the opening, which is about 1”, oval rather than round and flecked with orange. I haven’t seen it put out a mucous net, and it doesn’t seem to have an operculum. It retracts quickly sometimes, but spends most of the time at the opening of its tube. The fleshy part has a rough texture; it doesn’t retract if I put my hand or tweezers in slowly and touch it. It very much resembles an ordinary snail head. FullSizeRender.MOV Thanks WAMAS!