Love 'em. Great animals for the biofiltration. Normally live in the sand with only tentacles exposed as in the pic below from a hobbyist post in thereeftank.com. Their home ends up being a mound of sand as they reach out several inches to pull in sand particles to eat/clean detritus off of the particle.
Aloha,
Mark
Very large Spaghetti Worms I found in Hawaii. 1-2 foot long tentacles!
Edited by Mark Peterson - September 30 2016 at 1:19pm