Not sure how they spread and yes they are like tube worms a bit, great filter feeders.Cool! What’s the difference between a feather duster and tube worm. I thought both had tubes. There doesn’t seem to be a tube on the snail when the duster disappears. Unless it’s bored it’s way in or so small I can’t see it! Loves high flow and only disappears when poked!
Do they also spread like a tube worm does?