I have watching two of these tube worms develop over the past couple of weeks and have yet to identify them. They secrete a mucus web out into the water that is about 2" by 2", let particulates in the water column attach, them reingest the entire web with their catch. The whole process only takes about 5 minutes. Pretty cool to watch! Here are two pictures of the same worm with the web out. Any thoughts as far as ID, freind or foe??? They seem harmless so far but are growing at a steady rate.

