Nothing I've seen (in my tank) moves like this! What is it?

[SueAbu]

Well, You'll see- half opaque, half see-thru, bristle feet, antennae and a cork screw!! I was thinking bristle worms, but those just wriggle and sink, not swim and do laps!
... Either way, he ended up in the anemone corner. Buh bye (then I found another, smaller one....

 

[KrisReef]

I can't see the vids, but I reckon they are free anemone food, a good thing!

 

[ISpeakForTheSeas]

Well, You'll see- half opaque, half see-thru, bristle feet, antennae and a cork screw!! I was thinking bristle worms, but those just wriggle and sink, not swim and do laps!
... Either way, he ended up in the anemone corner. Buh bye (then I found another, smaller one....

That's a bristleworm - possibly a Dorvilleid worm more specifically, judging by the four cephalic tentacles. The swimming is unusual for bristleworms that aren't epitokes, but it's not unheard of. Cool to see the undulation as it moves!

 

[SueAbu]

That's a bristleworm - possibly a Dorvilleid worm more specifically, judging by the four cephalic tentacles. The swimming is unusual for bristleworms that aren't epitokes, but it's not unheard of. Cool to see the undulation as it moves!

My first thought was, *that's so cool!" My second thought was, "sheesh! How many pests can this (relatively) small tank hold!?!?" (I've got an amphipod overpopulation issue and a mandarin en route)

 

[SueAbu]

I can't see the vids, but I reckon they are free anemone food, a good thing!

I've done a couple outtakes. One is cropped so you can see his insides. The other is of him swimming away. Hopefully, the smaller videos will play for you.

 

[KrisReef]

I've done a couple outtakes. One is cropped so you can see his insides. The other is of him swimming away. Hopefully, the smaller videos will play for you.

Thanks, my phone is not cooperating. I will take a look at my workstation tomorrow. @ISpeakForTheSeas is more reliable for the invert world than I am, but I do want to see what you have.