Fast growing tube

if they start spitting netting into the water they are sessile snails

I've definately got thoughs. They are somewhat like spaghetti worms, but they have only two tentacles. They are like roaches, but in a good way. They keep my rock pretty clean. They are in the sand and every where. Whats funny is I know they only came from one rock.

yeah i have those to but i did'nt know they were a good thing