Bright red scallop looking thing on rocks

[swiss1939]

I got these long bugle looking shells on my rocks with bright red scallop mouths sticking out the end. Not sure exactly what they are. Anyone have an idea?

They are only about half an inch long at most. but this one rock has quite a few of them on it.

TBS rock that's about 6 months in this tank now.

 

[swiss1939]

Some form of vermetid snail?

 

[rayadog]

Little fan worms/feather dusters. They’re housed in those little white tracks that their heads come out at. Well, they’re not all white but still.

That’s my opinion