Uh... worm? Good... bad?

[andsoitgoes]

Okay - I don't have a pic yet, but I will take one after my girls pass out for the night...

I have these worms in the sandbed of my 44g cube. The only thing visible of the worms is what looks like red "strings"

I've taken one out, as it was right in the front, and it seems to look more akin to the feather duster than what bristleworms look like - I know a pic would help, but I figured the "tentacle things above the sand wiggling regularly, but the worm itself never coming out" would probably be of some use

Thanks