So. This tank is 6.5 gallons?? Wow! Kinda makes me wonder if there may be problems brewing afterall. I've had 2 starfish and 3-4 dusters in a tank, but that was 155g. 6.5?
Still, unless the star has long and nimble tentacles like the brittles or serpent stars, I can't see it getting to the worm inside that tube. Maybe not even then. Or does another type of star just choke it to death? Dunno.
"Life may not be the party we hoped for but while we are here we might as well dance!"