well i was actually looking at my reef tank tonight after i had already shut all the lights off for the night and i could still see the live rock that was close to the front of the glass from the light from other rooms and i noticed this noodle looking thing coming from the rock, probably about 2 inches what i saw and i turned on the lights quick to catch a glimpse but it sucked right into the the hole in the rock. what is this thing. i cant get a picture sorry!!