These pictures were taken with my video camera, i then put the video on my computer and took screenshots to make pictures....my regular camera doesn't work well in the dark

(i used the nightshot on my video camera and was very quiet)

I don't know what that worm is....if anyone knows I'm interested because I don't know if they are harmful or not...It seems to eat the algea surrounding its tube but I have about 5 or 6 small dusters on the same rock and I wonder if this nocturnal worm will kill my feather dusters.