Last night I got a chance to see these things coming out of a piece of LR~the title describes them~sorry wasn't able to get a pic~when I touched em with a wooden dowl they shot right back into their tiny lil holes~any ideas?
that is a vermitid snail check spelling I dont think it is right but it is a snail that lives in hard tubes and sends out the snot string to filter feed
they are harmless for the most part but can be anoying when you reach in the tank and get stabbed by a tube (ouch)
also in rare ocasions the feeding string can iritate a select few corals that are extremely sensitive